Reclaim Your Disk: Every App and Method to Find Useless Files on Windows (With and Without AI)

Your disk is full. Or maybe it is not full yet — but it is heading there, and you have no idea where all those gigabytes went. You installed a few things, downloaded some files, let a few projects accumulate, and now your 256 GB SSD is showing 15 GB free.

This guide covers everything: the built-in Windows tools that most people ignore, the best free third-party visualizers, duplicate file finders, AI-powered smart cleaners, developer-specific junk nukers, and a set of PowerShell one-liners you can run right now.

By the end, you will know not just what to delete — but where to look and how to look, so you never have to wonder again where your space went.

First: Understand Where Your Space Actually Goes

Before downloading any tool, understand the typical culprits on a Windows machine:

Common Space Hogs on a Windows PC:
─────────────────────────────────────────────────────────────────────
1. Windows Update leftovers (WinSxS folder)      → 5–15 GB
2. Hibernation file (hiberfil.sys)                → = RAM size (8–16 GB)
3. Page file (pagefile.sys)                       → 2–16 GB
4. Recycle Bin never emptied                      → 0–50 GB
5. Downloads folder                               → 0–100 GB (!!!)
6. Browser caches (Chrome, Firefox, Edge)         → 1–10 GB each
7. Duplicate photos / videos                      → 5–50 GB
8. node_modules (for developers)                  → 0.5–5 GB per project
9. Old game installs / forgotten software         → 5–100 GB
10. Docker images and unused WSL2 VHDXs           → 5–50 GB
11. Thumbnails cache                               → 0.5–2 GB
12. Windows.old (from an OS upgrade)              → 5–25 GB
13. Virtual machine snapshots                     → 10–200 GB
14. Zoom / Teams / OBS recordings                 → 5–100 GB

Now let us find and eliminate all of them.

Part 1: Built-In Windows Tools — Start Here First

1.1 Storage Sense (Windows 10 / 11)

What it is: Microsoft's official automatic disk cleaner. Zero installation required. It clears temp files, Recycle Bin, and can make rarely-used OneDrive files "online-only" to free local space.

Where to find it:

Settings (Win + I) → System → Storage → Storage Sense

Configure it for maximum effect:

Enable the toggle → click "Storage Sense" to open settings.
Set "Run Storage Sense" → Every week.
Delete temp files that apps aren't using → On.
Delete files in the Recycle Bin for more than → 30 days.
Delete files in Downloads that haven't been opened for → 60 days. (Only enable this if you manage Downloads actively — it will delete old downloaded files automatically.)
Scroll down → click "Run Storage Sense now".

How much it typically frees: 1–8 GB on average. More on machines that haven't been cleaned in a year.

Pro tip — also run Disk Cleanup with system files:

Press Win + R → type cleanmgr → select your C: drive → click "Clean up system files" (runs as Admin). This unlocks additional categories:

Windows Update Cleanup → often 3–12 GB
Windows upgrade log files → 0.5–2 GB
Previous Windows installations (Windows.old) → 5–25 GB
Temporary Internet Files → 0.5–5 GB

The "Windows Update Cleanup" and "Previous Windows installations" options are the biggest wins here. Do not skip them.

1.2 Microsoft PC Manager (Free, from Microsoft Store)

What it is: Microsoft's official utility that consolidates cleanup features into one dashboard. Free, no ads, no bloatware push.

Install:

Search "Microsoft PC Manager" in the Microsoft Store → Get

Or install via winget:

winget install --id Microsoft.PCManager -e --silent

Key features for disk cleanup:

Deep Cleanup tab: Scans system junk, log files, browser caches, and orphaned app data in one pass.
Large Files scan: Shows the largest files on your drives, sorted by size — lets you decide what to delete manually.
Storage view: Shows a breakdown similar to Settings → Storage.
Startup apps: Disable apps that slow down boot without uninstalling them.

Verdict: The safest "one-click" cleaner because it uses Windows' own APIs rather than third-party algorithms. Will not touch anything that could break your system. However, it is not the most powerful tool for hunting down deep junk.

1.3 DISM Component Store Cleanup (Command Line)

The C:\Windows\WinSxS folder can grow to 10–20 GB over time. Windows keeps old update components here in case you need to roll back. DISM can safely remove superseded components:

# Open PowerShell as Administrator

# Step 1: Analyze the component store (see how much is recoverable)
Dism.exe /Online /Cleanup-Image /AnalyzeComponentStore

# Step 2: Clean up superseded update components
# Safe: only removes components that have been replaced by newer ones
Dism.exe /Online /Cleanup-Image /StartComponentCleanup

# Step 3: More aggressive clean (removes everything that is not active)
# Warning: cannot roll back updates after this
Dism.exe /Online /Cleanup-Image /StartComponentCleanup /ResetBase

Typical savings from /StartComponentCleanup: 2–8 GB. From /ResetBase on an old, well-updated system: up to 12 GB.

Part 2: Disk Space Visualizers — See Where Everything Is

These tools give you a visual map of your entire disk so you can find the biggest culprits at a glance. Think of them as X-ray vision for your storage.

2.1 WizTree — The Fastest Disk Analyzer Available

Type: Free (personal use), paid (commercial) Download: diskanalyzer.com/wiztree

WizTree reads the NTFS Master File Table (MFT) directly — the same internal index Windows itself uses — instead of walking every folder recursively. This makes it dramatically faster than competitors:

Scanning a 1 TB drive with 500,000 files:

WizTree:      ~3–8 seconds
TreeSize:     ~30–60 seconds
WinDirStat:   ~3–8 minutes

What you get:

A treemap view: colored rectangles proportional to file size. The bigger the rectangle, the bigger the file. Instant visual identification of space hogs.
A file list view: sorted by size, shows the largest files and folders anywhere on the drive.
Filter by file extension: want to see all .mp4 files? All *.log files? Filter in one click.
Export to CSV for spreadsheet analysis.

How to use it effectively:

Install and run as Administrator.
Select drive C: (or whichever you want to analyze).
In the treemap, look for the biggest rectangles — hover to see the file name and size.
Common large surprises: game installs in unexpected locations, Zoom/Teams recordings in Documents, Docker VHDX files, old .iso installer files.
Switch to "Files" tab → sort by size → identify every file over 1 GB and decide if you still need it.

Best for: Power users who want maximum speed and direct control. You decide what to delete — WizTree just shows you where everything is.

2.2 WinDirStat — Open-Source Classic

Type: Free, open-source (GPL) Download: windirstat.net

The classic disk visualizer that millions of Windows users have trusted since the early 2000s. Recently updated with multi-threaded scanning for much better speed on modern multi-core CPUs. Fully open-source — you can review the code yourself.

What makes WinDirStat unique:

Color-coded file type legend: each file type gets a unique color in the treemap. Easy to spot when, say, 40% of your disk is videos or 40% is one specific application's data.
No telemetry, no ads, no sign-up required.
Portable — run from a USB drive without installing.

When to choose WinDirStat over WizTree:

When you value open-source transparency over speed.
When scanning a non-NTFS drive (FAT32, exFAT) where MFT tricks do not apply — both tools scan similarly in this case.
On drives with fewer than 100,000 files — the speed difference becomes negligible.

2.3 TreeSize Free — The Professional Option

Type: Free version available; paid Professional version for businesses Download: jam-software.com/treesize

TreeSize takes a more traditional folder-tree approach rather than a treemap. If you think in terms of "folders" rather than colored blocks, TreeSize's hierarchical view may feel more natural.

Free vs. Professional:

Free: Scan local drives, view by folder/file, search for large files.
Professional: Network drive scanning, scheduling, reports, age-based analysis, duplicate detection.

What the free version does well:

Age analysis: Shows when files were last accessed. Folders you have not touched in 2 years are obvious candidates for archiving.
Size breakdown: Click any folder to see its total size including all sub-folders.
Integrates into Windows Explorer right-click menu (optional).

Part 3: Duplicate File Finders — Stop Paying for the Same Data Twice

Duplicates are surprisingly common. Every time you copy "just in case", download the same photo from WhatsApp twice, or re-download software installers, you are wasting space with identical data.

3.1 dupeGuru — Open-Source with Fuzzy Matching (Best Overall)

Type: Free, open-source (GPLv3) Download: dupeguru.voltaicideas.net

dupeGuru is the most powerful free duplicate finder because it can find both exact duplicates (identical byte-for-byte files) and similar files (same image with different sizes, same song with different tags).

Three scanning modes:

Mode	What it finds	Best for
Standard	Exact byte-for-byte duplicates (any file type)	Documents, downloads
Music	Similar audio: same song, different bitrate/tag	iTunes/Spotify downloads
Picture	Similar images: same photo, different crop/size	WhatsApp/camera libraries

How to use for photo libraries:

Open dupeGuru → Switch to Picture mode.
Add your Pictures folder and any phone backup folders.
Set Match % → 95% (finds near-identical images).
Scan → review → delete the lower-quality versions, keeping the highest resolution.

Safety features:

Sends files to Recycle Bin by default (not permanent delete).
"Mark dupe group" — automatically marks all but one copy per group.
Preview images before deleting (in Picture mode).

3.2 AllDup — Maximum Control for Power Users

Type: Free (freeware, personal use) Download: alldup.info

AllDup gives you more granular control than any other free tool. You can define exactly what "duplicate" means:

Match by: file content (hash), file name, file size, last modified date, or any combination.
Include/exclude specific folders or file types.
Scan across network drives and external drives simultaneously.
Results grouped by "duplicate group" — you see all copies together.

Advanced workflow for large document libraries:

Settings in AllDup for a deep scan:
  ✅ Compare file content (MD5/SHA1 hash — exact match)
  ✅ Include subdirectories
  ✅ Scan hidden files
  ✅ Skip files smaller than 100 KB (optional — avoids tiny system files)
  Exclude folders:
    C:\Windows\
    C:\Program Files\
    C:\Program Files (x86)\

After scanning, use "Select oldest copy" → delete → you keep the most recently modified version of every duplicate.

3.3 Auslogics Duplicate File Finder — Easiest for Beginners

Type: Free Download: auslogics.com/en/software/duplicate-file-finder

If you want to get started without reading documentation, Auslogics has the most polished beginner-friendly interface. Three steps:

Choose folders to scan.
Choose file types (All Files, or just Images / Music / Video / Documents).
Scan → review → delete.

Results are color-coded by file type, making it visually easy to spot what is consuming space. Sends duplicates to a dedicated Backup folder before deletion — you can restore if you make a mistake.

When to use Auslogics vs. dupeGuru:

Auslogics: You are not technical, want simple one-click operation.
dupeGuru: You have a large media library with similar (not just identical) files.

Part 4: General Junk Cleaners

4.1 BleachBit — Open-Source CCleaner Alternative

Type: Free, open-source (GPL) Download: bleachbit.org

BleachBit is the open-source equivalent of CCleaner, without CCleaner's controversial history (it was once caught including unwanted software). BleachBit cleans:

Browser caches: Chrome, Firefox, Edge, Brave, Opera (all at once)
Temp files and application logs
Thumbnail cache
MRU lists (recently opened files lists)
System memory dumps and crash reports

Notable feature — Command Line mode:

# Run BleachBit silently from PowerShell
& "C:\Program Files\BleachBit\bleachbit_console.exe" `
    --preset `
    --clean `
    google_chrome.cache `
    microsoft_edge.cache `
    firefox.cache `
    system.recycle_bin `
    system.tmp

This is useful for scheduling a monthly automated cleanup via Task Scheduler.

4.2 CCleaner — The Household Name (Use with Caution)

Type: Free (basic) / Paid (Pro) Download: ccleaner.com

CCleaner is the most downloaded PC cleaner in history. It works. However, use it with caution:

Its Registry Cleaner is frequently criticized for causing more problems than it solves. Skip it entirely.
In 2017, CCleaner was temporarily bundled with a backdoor trojan (before Avast acquired it). The current version (2024/2025) is clean but the reputation damage remains.
Stick to the Custom Clean section for temp files and browser caches. Avoid the "Optimizer" and "Registry" modules.

Safe CCleaner use:

Open CCleaner → Custom Clean tab.
Check only: Windows section → Temp files, Recycle Bin, Clipboard.
Check: Applications section → your browsers' caches.
Uncheck: Registry, Windows Old Prefetch, Taskbar Jump Lists.
Click Analyze → review the list → Run Cleaner.

4.3 The Unarchiver / PeaZip — Find and Delete Redundant Archives

After you extract a ZIP or RAR archive, the original archive often sits on your disk alongside the extracted folder, doubling the space. Search for old archives you have already extracted:

# Find all .zip, .rar, .7z, .iso files on your C: drive sorted by size
Get-ChildItem -Path "C:\" -Include "*.zip","*.rar","*.7z","*.iso","*.tar*" `
    -Recurse -ErrorAction SilentlyContinue |
    Sort-Object Length -Descending |
    Select-Object -First 20 FullName,
        @{N="Size_MB";E={[math]::Round($_.Length/1MB,1)}},
        LastWriteTime |
    Format-Table -AutoSize

Review the output — any archive you extracted more than 6 months ago is almost certainly safe to delete.

Part 5: AI-Powered Tools — The New Generation

5.1 What "AI" Actually Means in Disk Cleanup Tools

Before listing AI-powered tools, be honest about what these terms mean:

Claim	What it usually means
"AI-powered"	Rule-based heuristics with ML classification of file types
"Smart cleanup"	Whitelist/blacklist of known safe-to-delete file patterns
"Intelligent scan"	Priority scoring based on file age, access time, and size
"Deep learning"	Often marketing language — verify by checking the product

True AI (neural networks trained on file behavior) is rare in this space. Most tools that claim AI are using sophisticated rule engines. That is not bad — it is just not ML inference.

Real AI-adjacent use cases exist in:

Semantic file search (Windows Copilot / Copilot+ PCs with NPU)
Duplicate image detection using perceptual hashing (dupeGuru's picture mode)
Face and scene recognition in photo libraries (Google Photos, Apple Photos — not disk cleaning, but smart organization)

5.2 IObit Advanced SystemCare — AI-Assisted Junk Removal

Type: Free (basic) / Paid (Pro) Download: iobit.com/advancedsystemcare

Advanced SystemCare markets its "AI-powered" engine as intelligently identifying junk based on patterns from millions of scans. In practice, it uses a frequently-updated database of known junk file patterns (temp folder locations, browser cache paths, log directories for specific apps) combined with heuristic file age scoring.

What it genuinely does well:

Identifies app-specific cache folders that generic cleaners miss.
"Turbo Boost" mode temporarily stops background processes for better performance during resource-intensive tasks.
Browser protection against homepage hijacking.
Startup item management with risk scores.

Caution: The free version constantly upsells the Pro version and may install toolbar software during the installation wizard. During install: uncheck "Install IObit Driver Booster" and all optional add-ons. Read every installation screen.

5.3 Gemini 2 (Mac) / AI Image Duplicate Finders (Windows)

On Mac, Gemini 2 by MacPaw is the gold standard for AI-powered duplicate detection — it uses neural networks to identify similar images, not just identical byte sequences.

For Windows, the equivalent capability is offered by:

Duplicate Cleaner Pro (paid, ~$30 one-time):

Uses perceptual hashing for image comparison — finds rotated, cropped, or differently-compressed versions of the same photo.
Scans face similarity across portrait photo collections.
Worth it if you have 10,000+ photos from multiple devices.

Free alternative: dupeGuru's Picture mode (covered in Part 3) offers similar perceptual hashing for free.

5.4 Windows Copilot / Search for Semantic File Finding

On Windows 11 with Copilot+ (NPU-equipped devices like Snapdragon X Elite, Intel Core Ultra 200V), Microsoft's Recall feature and enhanced semantic search can help you find files by describing their content rather than their name:

Example queries (Windows Search / Copilot):
"Show me PDF documents from last year I haven't opened recently"
"Find images of my car"
"Documents related to my bank"

This is not traditional disk cleaning — it is intelligent file retrieval that helps you identify which files are even worth keeping before you decide to clean.

For standard Windows 10/11 without AI hardware acceleration:

# Use PowerShell to simulate "smart" file finding with last access time
# Find files NOT opened in the last 12 months (potential candidates for archiving)
Get-ChildItem -Path "C:\Users\$env:USERNAME\Documents" `
    -Recurse -File -ErrorAction SilentlyContinue |
    Where-Object { $_.LastAccessTime -lt (Get-Date).AddMonths(-12) } |
    Sort-Object Length -Descending |
    Select-Object -First 30 FullName,
        @{N="Size_MB";E={[math]::Round($_.Length/1MB,1)}},
        LastAccessTime |
    Format-Table -AutoSize

5.5 SpaceSniffer — Interactive Real-Time Treemap

Type: Free (portable, no install) Download: uderzo.it/main_products/space_sniffer

SpaceSniffer is unique: its treemap animates in real time as the scan progresses. Squares grow and shrink as the tool discovers files. It also lets you drill down interactively — double-click any rectangle to zoom into that folder, seeing all its contents scaled proportionally.

This interactive drill-down is actually more intuitive for disk exploration than static treemaps. You explore like you are flying over a landscape, zooming into dense areas.

Part 6: Developer-Specific Junk — Gigabytes of Hidden Waste

If you are a developer, you have a unique category of disk hogs that general cleaning tools completely miss.

6.1 node_modules — The Famous Black Hole

Every JavaScript/TypeScript project you ever started and forgot about has a node_modules folder. These can be 500 MB to 2 GB each. If you have 20 old projects sitting in C:\Code\, that is potentially 10–40 GB.

# Find all node_modules folders and their sizes
Get-ChildItem -Path "C:\Users\$env:USERNAME" -Directory `
    -Filter "node_modules" -Recurse -ErrorAction SilentlyContinue |
    Select-Object @{
        N="Path";
        E={$_.FullName}
    },
    @{
        N="Size_GB";
        E={
            [math]::Round(
                (Get-ChildItem $_.FullName -Recurse -ErrorAction SilentlyContinue |
                 Measure-Object -Property Length -Sum).Sum / 1GB, 2
            )
        }
    } |
    Sort-Object Size_GB -Descending |
    Format-Table -AutoSize

# To delete them all (use with caution — verify you have package.json):
# Get-ChildItem -Path "C:\Users\$env:USERNAME" -Directory `
#     -Filter "node_modules" -Recurse -ErrorAction SilentlyContinue |
#     ForEach-Object {
#         Write-Host "Deleting: $($_.FullName)"
#         Remove-Item $_.FullName -Recurse -Force
#     }

Tool: npkill — the dedicated node_modules cleaner:

# Install globally (requires Node.js)
npm install -g npkill

# Run in your projects directory — interactive deletion UI
npx npkill
# Navigates with arrow keys, press Space to delete a node_modules
# Shows the size saved in real time

6.2 Docker Images and Containers

If you run Docker (or have WSL2 with Docker), unused images can accumulate:

# From Windows — view Docker disk usage
docker system df

# Example output:
# TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
# Images          15        3         12.6GB    9.4GB (74%)
# Containers      8         2         1.2GB     800MB
# Local Volumes   12        4         5.8GB     3.2GB

# Clean up everything unused (images, stopped containers, unused networks)
docker system prune -a --volumes
# WARNING: -a and --volumes removes ALL unused items
# Without -a: only removes dangling (untagged) images

6.3 Python Virtual Environments

# Find all .venv and venv folders
Get-ChildItem -Path "C:\Users\$env:USERNAME" -Directory `
    -Filter ".venv" -Recurse -ErrorAction SilentlyContinue |
    Select-Object FullName

Get-ChildItem -Path "C:\Users\$env:USERNAME" -Directory `
    -Filter "venv" -Recurse -ErrorAction SilentlyContinue |
    Select-Object FullName

Delete any virtual environment folder from old/abandoned projects. You can recreate them with python -m venv .venv and pip install -r requirements.txt.

6.4 WSL2 VHDX Files

# Find all WSL2 virtual disk files (VHDX)
Get-ChildItem "$env:LOCALAPPDATA\Packages" -Directory |
    ForEach-Object {
        Get-ChildItem $_.FullName -Filter "*.vhdx" -Recurse `
            -ErrorAction SilentlyContinue
    } |
    Select-Object FullName, @{N="Size_GB";E={[math]::Round($_.Length/1GB,2)}}

If you have old WSL2 distributions you no longer use:

# List all installed WSL distributions
wsl --list --verbose

# Unregister (delete) a distribution you no longer use
wsl --unregister Ubuntu-20.04
# This deletes the VHDX and frees all that space immediately

6.5 Game Development Cache (Unity, Unreal, Godot)

Tool	Cache Location	Typical Size
Unity	`C:\Users\<user>\AppData\Local\Unity`	2–15 GB
Unity	`Library\` folder in each project	1–10 GB each
Unreal	`C:\Users\<user>\AppData\Local\UnrealEngine`	5–20 GB
Godot	`.godot\` folder in each project	0.5–3 GB

Unity's Library folder in each project directory is the biggest offender. It is 100% safe to delete — Unity rebuilds it when you open the project again (at the cost of ~5–10 minutes of import time).

Part 7: The Master PowerShell Audit Script

Run this script once to get a comprehensive snapshot of every major space hog on your system. Copy, save as disk-audit.ps1, and run as Administrator:

#Requires -Version 5.0
# ═══════════════════════════════════════════════════════════════
# Windows Disk Space Audit Script
# Finds the most common space hogs in one run
# Run as Administrator for complete results
# ═══════════════════════════════════════════════════════════════

$user    = $env:USERNAME
$profile = $env:USERPROFILE
$report  = @()

Write-Host "`n═══════════════════════════════════" -ForegroundColor Cyan
Write-Host " WINDOWS DISK AUDIT — $env:COMPUTERNAME" -ForegroundColor Cyan
Write-Host "═══════════════════════════════════`n" -ForegroundColor Cyan

# ── Helper: Get folder size ────────────────────────────────────
function Get-FolderSize {
    param([string]$Path)
    if (Test-Path $Path) {
        $size = (Get-ChildItem $Path -Recurse -Force -ErrorAction SilentlyContinue |
                 Measure-Object -Property Length -Sum).Sum
        return [math]::Round($size / 1GB, 2)
    }
    return 0
}

# ── 1. Drive Overview ──────────────────────────────────────────
Write-Host "► DRIVE USAGE" -ForegroundColor Yellow
Get-PSDrive -PSProvider FileSystem |
    Where-Object { $_.Used -gt 0 } |
    Select-Object Name,
        @{N="Used_GB"; E={[math]::Round($_.Used/1GB,1)}},
        @{N="Free_GB"; E={[math]::Round($_.Free/1GB,1)}},
        @{N="Total_GB";E={[math]::Round(($_.Used+$_.Free)/1GB,1)}},
        @{N="% Used";  E={[math]::Round(($_.Used/($_.Used+$_.Free))*100,0)}} |
    Format-Table -AutoSize

# ── 2. Known Large System Files ────────────────────────────────
Write-Host "`n► KNOWN LARGE SYSTEM FILES" -ForegroundColor Yellow
$systemFiles = @(
    @{Name="Hibernation file (hiberfil.sys)"; Path="C:\hiberfil.sys"},
    @{Name="Page file (pagefile.sys)";        Path="C:\pagefile.sys"},
    @{Name="Windows.old (old OS)";            Path="C:\Windows.old"},
    @{Name="MiniDump crash files";            Path="C:\Windows\Minidump"}
)
foreach ($f in $systemFiles) {
    if (Test-Path $f.Path) {
        $sz = [math]::Round(
            (Get-ChildItem $f.Path -Force -ErrorAction SilentlyContinue |
             Measure-Object Length -Sum).Sum / 1GB, 2)
        Write-Host "  $([string]($sz).PadLeft(6)) GB  → $($f.Name)" -ForegroundColor White
    }
}

# ── 3. User Folder Breakdown ───────────────────────────────────
Write-Host "`n► USER FOLDER SIZES" -ForegroundColor Yellow
$userDirs = @("Desktop","Documents","Downloads","Pictures","Videos","Music")
foreach ($dir in $userDirs) {
    $path = Join-Path $profile $dir
    $size = Get-FolderSize $path
    if ($size -gt 0.01) {
        $bar = "█" * [math]::Min([math]::Round($size * 2), 30)
        Write-Host ("  {0,6} GB  {1,-30} {2}" -f $size, $bar, $dir) -ForegroundColor White
    }
}

# ── 4. AppData Caches ──────────────────────────────────────────
Write-Host "`n► APPDATA CACHE SIZES" -ForegroundColor Yellow
$cacheTargets = @(
    @{Name="Temp (User)";                Path="$profile\AppData\Local\Temp"},
    @{Name="Thumbnails Cache";           Path="$profile\AppData\Local\Microsoft\Windows\Explorer"},
    @{Name="Chrome Cache";              Path="$profile\AppData\Local\Google\Chrome\User Data\Default\Cache"},
    @{Name="Edge Cache";                Path="$profile\AppData\Local\Microsoft\Edge\User Data\Default\Cache"},
    @{Name="Firefox Cache";             Path="$profile\AppData\Local\Mozilla\Firefox\Profiles"},
    @{Name="Spotify Cache";             Path="$profile\AppData\Local\Spotify\Storage"},
    @{Name="Teams/Skype Media Cache";   Path="$profile\AppData\Roaming\Microsoft\Teams\Cache"},
    @{Name="Windows Installer Cache";   Path="C:\Windows\Installer"},
    @{Name="WinSxS (Component Store)";  Path="C:\Windows\WinSxS"}
)
foreach ($c in $cacheTargets) {
    $size = Get-FolderSize $c.Path
    if ($size -gt 0.05) {
        Write-Host ("  {0,6} GB  → {1}" -f $size, $c.Name) -ForegroundColor White
    }
}

# ── 5. Developer Junk ──────────────────────────────────────────
Write-Host "`n► DEVELOPER JUNK FOLDERS" -ForegroundColor Yellow

# node_modules
$nodeMods = Get-ChildItem -Path $profile -Directory -Filter "node_modules" `
    -Recurse -ErrorAction SilentlyContinue |
    Select-Object -First 10
if ($nodeMods) {
    Write-Host "  Found $($nodeMods.Count)+ node_modules folder(s):" -ForegroundColor White
    foreach ($nm in $nodeMods | Select-Object -First 5) {
        $size = Get-FolderSize $nm.FullName
        Write-Host "    $size GB  → $($nm.FullName)" -ForegroundColor Gray
    }
}

# Python venvs
$venvs = Get-ChildItem -Path $profile -Directory `
    -Include ".venv","venv","env" -Recurse -ErrorAction SilentlyContinue
if ($venvs) {
    Write-Host "  Found $($venvs.Count) Python virtual environment(s)" -ForegroundColor White
}

# ── 6. Top 20 Largest Files on C: ─────────────────────────────
Write-Host "`n► TOP 20 LARGEST FILES ON C:\" -ForegroundColor Yellow
Get-ChildItem -Path "C:\" -Recurse -File -Force `
    -ErrorAction SilentlyContinue |
    Sort-Object Length -Descending |
    Select-Object -First 20 FullName,
        @{N="Size_GB";E={[math]::Round($_.Length/1GB,2)}},
        LastWriteTime |
    Format-Table -AutoSize

# ── 7. Largest Files in Downloads ─────────────────────────────
Write-Host "`n► DOWNLOADS FOLDER — FILES > 100 MB" -ForegroundColor Yellow
Get-ChildItem -Path "$profile\Downloads" -Recurse -File `
    -ErrorAction SilentlyContinue |
    Where-Object { $_.Length -gt 100MB } |
    Sort-Object Length -Descending |
    Select-Object @{N="File";E={$_.Name}},
        @{N="Size_GB";E={[math]::Round($_.Length/1GB,2)}},
        LastWriteTime |
    Format-Table -AutoSize

Write-Host "`n═══════════════════════════════════" -ForegroundColor Cyan
Write-Host " AUDIT COMPLETE" -ForegroundColor Cyan
Write-Host " Review the output above and decide what to delete." -ForegroundColor Cyan
Write-Host "═══════════════════════════════════`n" -ForegroundColor Cyan

Part 8: What Is Safe to Delete — The Definitive Table

Use this as a reference every time you are not sure about a file or folder:

Location / File	Safe to Delete?	Notes
`%TEMP%` (User temp folder)	✅ Yes	Skip files "in use" — Windows will warn you
`C:\Windows\Temp`	✅ Yes	Run as Admin
`C:\Windows\Prefetch\`	✅ Yes (optional)	Apps load slightly slower after first boot
`C:\Windows.old\`	✅ Yes	Only present after Windows upgrade
`C:\Windows\SoftwareDistribution\Download\`	✅ Yes	Cached Windows Update downloads (re-downloads if needed)
`Recycle Bin`	✅ Yes	Empty it
`hiberfil.sys`	✅ If no hibernate	`powercfg /hibernate off` to remove
`Downloads` folder old files	✅ Review first	Check before bulk deleting
Browser cache folders	✅ Yes	Browser re-downloads as needed
Spotify / Netflix / YouTube offline downloads	✅ Yes (optional)	Re-download anytime
`node_modules`	✅ Yes	Run `npm install` to restore from `package.json`
Python `.venv` / `venv`	✅ Yes	Recreate with `pip install -r requirements.txt`
Unity `Library\` (inside project)	✅ Yes	Unity rebuilds on next open (~10 min wait)
Docker unused images	✅ Yes	`docker system prune -a`
`C:\Windows\WinSxS\`	⚠️ Use DISM only	Never delete manually — use `Dism /Cleanup-Image`
`C:\Windows\Installer\`	❌ No	Required to modify/uninstall programs
`C:\Users\<user>\AppData\`	❌ No	Contains app settings, configs, saved data
`C:\Program Files\`	❌ No	Use proper uninstaller
`pagefile.sys`	❌ No	Windows virtual memory — do not delete
Any `.dll` file in Windows or Program Files	❌ No	Could break installed software

Part 9: The Recommended Cleanup Workflow (30 Minutes)

Follow this order every 3–6 months for a complete disk refresh:

Step 1 — Quick Wins (5 minutes)

# As Administrator:
# 1. Empty temp folders
Remove-Item -Path "$env:TEMP\*" -Recurse -Force -ErrorAction SilentlyContinue
Remove-Item -Path "C:\Windows\Temp\*" -Recurse -Force -ErrorAction SilentlyContinue

# 2. Empty Recycle Bin
Clear-RecycleBin -Force -ErrorAction SilentlyContinue

# 3. Run Disk Cleanup with system files
Start-Process cleanmgr -ArgumentList "/d C: /sageset:1" -Wait
# After configuration, run it:
Start-Process cleanmgr -ArgumentList "/d C: /sagerun:1" -Wait

Step 2 — Visualize (10 minutes)

Download and run WizTree.
Scan C: drive — takes under 10 seconds.
Look at the treemap: what is the biggest block?
Switch to Files tab → find every file over 500 MB and decide: keep, move to HDD, or delete.

Step 3 — Duplicates (10 minutes)

Run dupeGuru in Standard mode on your Documents and Downloads folders.
Run in Picture mode on your Photos/Pictures folder.
Review groups, delete confirmed duplicates.

Step 4 — DISM Cleanup (5 minutes, automated)

Dism.exe /Online /Cleanup-Image /StartComponentCleanup

Let it run in the background. This is the safest way to shrink WinSxS.

Step 5 — Developer Cleanup (if applicable)

Run npx npkill in your projects root.
Run docker system prune if using Docker.
Delete Python venvs from abandoned projects.

Summary: Which Tool for Which Job

Problem	Best Tool	Free?
"Where did my disk space go?"	WizTree (fastest)	✅
Open-source disk map	WinDirStat	✅
Folder tree view, age analysis	TreeSize Free	✅
Exact duplicate files	AllDup or Auslogics	✅
Similar photos (near-duplicates)	dupeGuru (Picture mode)	✅
Browser caches, temp files	BleachBit or Microsoft PC Manager	✅
Windows Update leftovers, WinSxS	Disk Cleanup + DISM	✅
node_modules cleanup	npkill (npm)	✅
Docker images and volumes	`docker system prune`	✅
Systematic, automated audit	PowerShell audit script (above)	✅
Hands-off automatic monthly cleanup	Storage Sense (built-in)	✅
AI-assisted photo near-duplicate removal	Duplicate Cleaner Pro	💰

Every tool listed as free is genuinely free with no essential features locked behind a paywall. Start with WizTree for situational awareness, add dupeGuru for duplicates, and use the PowerShell audit script for a developer-grade deep dive — and you will know exactly where every gigabyte on your disk has been hiding.