⚡ Quick Wins (Do These First)
01 Use Storage Sense (Easiest Built-in Tool)
- Turn on Storage Sense
- Click Run Storage Sense now or configure it to automatically clean temporary files, downloads, and recycle bin
- Windows 11 bonus: You'll see a nice breakdown of what's using space (Apps, Temporary files, etc.)
02 Disk Cleanup Tool (Classic & Powerful)
- Check all boxes (especially Temporary files, System files, Recycle Bin)
- Click Clean up system files for even more options (Windows Update files, old Windows installations)
- Old Windows installations (Windows.old) can be 10–25GB — safe to delete if you don't need to roll back
03 Remove Unwanted Apps and Bloatware
- Sort by Size to find the biggest space-wasters first
- Uninstall large unused programs, games, and manufacturer bloatware (McAfee, Candy Crush, Spotify, etc.)
- Pay special attention to games — modern games can be 50–150GB each
Don't recognise the app?
Search the app name online before uninstalling. Some system components shouldn't be removed, but most pre-installed manufacturer bloatware is safe to remove.
04 Clean Temporary and Download Folders
- Delete contents of C:\Windows\Temp
- Delete contents of C:\Users\YourUsername\AppData\Local\Temp
- Clean your Downloads folder — move important files elsewhere first, then delete the rest
- Quick shortcut: Press Win + R → type
%temp%→ Delete all
05 Remove Large Unused Files
- Open File Explorer and navigate to This PC
- Use search to find large files:
size:>500MB - Look for old videos, ISO files, disk backups, and installer files
- Consider moving personal files (Photos, Videos, Documents) to an external drive or cloud storage
Search operators you can use
size:>1GB — find files larger than 1GB. size:>500MB — files over 500MB. *.iso — find ISO files. *.exe — find installer files.
06 OneDrive / Cloud Storage Management
- Right-click OneDrive icon in system tray → Settings → Files On-Demand (keeps files in cloud, frees local space)
- Files are visible but only downloaded when you open them
- Saves significant space if you have many files in OneDrive
07 Advanced Cleaning Options
| Method | Space Saved | Difficulty | Best For |
|---|---|---|---|
| Storage Sense + Disk Cleanup | 5–30 GB | Very Easy | Everyone |
| Uninstall Apps | 10–100+ GB | Easy | Heavy users |
| Delete Hibernation File | Up to 75% of RAM | Medium | Advanced |
| Compress OS Drive | 5–15 GB | Medium | Low space |
| Remove Old Windows Install | 10–25 GB | Easy | After major updates |
How to Delete the Hibernation File
The hibernation file (hiberfil.sys) can be 50–75% of your RAM size. If you don't use hibernation, you can disable it to free up space.
powercfg -h off
How to Compress Your OS Drive
Compression saves space but may slightly impact performance. Works well on drives that are almost full with document files.
- Right-click C: drive → Properties
- Check "Compress this drive to save disk space"
- Click Apply → OK (this may take 10-30 minutes)
Note about compression
Compression is safe but can slightly slow down file access. For modern SSDs, the impact is minimal. Don't compress your entire drive if you have a very old (slow) computer.
📅 Maintenance Routine
Empty Recycle Bin
Clear Downloads folder
Check for large unused files
Review installed apps
Golden rule
Keep at least 20–25% free space on your C: drive for best performance. Windows needs room for updates, temporary files, and virtual memory. If you're constantly running low, consider upgrading to a larger SSD.
💡 Pro Tips
- Use Microsoft PC Manager — Microsoft's official free cleanup and optimisation tool. Download from the Microsoft Store. It shows memory usage, temp file cleanup, and startup management in one place.
- Avoid third-party "PC cleaners" — Many are ineffective, and some are malware. The built-in Windows tools do everything you need for free.
- Check for large hidden folders — C:\Users\YourUsername\AppData can contain GBs of cached data from browsers and apps.
- In Windows 11, use the improved Storage page for better recommendations and a visual breakdown of what's using space.
- Use WinDirStat or WizTree — Free tools that show you a visual map of what's using space on your drive. Great for finding large files you forgot about.
❌ Common Mistakes to Avoid
- Deleting system files manually — Don't delete files from C:\Windows unless you're absolutely sure what they are. Use Disk Cleanup instead.
- Removing programs without knowing what they do — Search online before uninstalling any system component or driver software.
- Ignoring large hidden system restore points — System Restore can use up to 5-10% of your drive. Adjust the allocated space in System Properties → System Protection → Configure.
- Forgetting to empty Recycle Bin — Deleted files stay in the Recycle Bin until you empty it, taking up space.
- Not restarting after cleaning — A restart ensures all changes take effect and clears any remaining temp files in use.
Your Drive Now Has Breathing Room
After cleaning, restart your PC and check the drive properties again. You should see a significant increase in free space. Regular maintenance prevents disk space from becoming a crisis again.