Tips to Quickly Pinpoint Junk Files on C

Finding junk = sorting + filtering. Use the right method to lock the big hitters in minutes.

• After scanning, sort by folder size, focus on the top 10, and drill down to files.
• Show hidden files—logs in AppData and ProgramData are often ignored.
• Filter extensions: .log, .tmp, .bak, .dmp, *.old are usually safe to delete; when unsure, back up first.
• Browser/WeChat/QQ/Steam caches are common fat, usually in AppData\Local or AppData\Roaming.
• On corporate machines, use AV/Defender hints, avoid protected directories, and pause real-time protection if needed.
• Save the report so next time you jump straight to the same hotspots.

Command-line locating

• dir /s /a:-d | sort gives a rough view of big files, but TreeSize is more visual.
• PowerShell Get-ChildItem -Recurse | Sort Length -Descending | Select -First 20 is also fast.

Small tip

Screenshot or save the CSV; next time, compare the top folders directly instead of hunting again.

Further reading

• Guide to Finding and Handling Large Files on C
• C Drive Cache and Temp Cleanup Guide
• Lightweight Command-Line C Drive Cleanup
• Settings to Avoid Accidental Deletion on C Drive
• Choosing C Drive Cleanup Software