Some temporary files are disposable. Your Downloads folder is not automatically junk. Windows 11 lists removable data under Temporary files, and the key is to read each category before you tick it.
Go to Settings → System → Storage → Temporary files. Windows scans and lists categories such as temporary files, thumbnails, Delivery Optimization files, cached update data, Windows upgrade files and the Recycle Bin. The exact list depends on the PC.
Temporary files and thumbnails are rebuilt by Windows or the apps that use them. Delivery Optimization files are cached update pieces. Removing them frees space and is normally harmless, although things may be slightly slower the first time they are rebuilt.
Downloads: this is your own folder, often a holding area for installers and documents. Leave it unticked unless you have checked it.
Recycle Bin: files here are still recoverable until you empty it. Make sure nothing in it is needed.
Previous Windows installation and Windows upgrade files: deleting them can free a lot of space but removes the option to go back to the earlier version.
Search for Disk Cleanup (or run cleanmgr), pick the Windows drive and select Clean up system files for extra categories. The same rule applies: read each entry first.
Storage Sense (Settings → System → Storage → Storage Sense) can remove temporary files and old Recycle Bin contents on a schedule. Review its rules before enabling it and keep automatic Downloads cleanup off unless you really want it.
Clearing temporary files recovers space; it does not increase CPU, GPU or internet speed. If the real problem is a large game, a video folder or a slow app, see our guides on freeing disk space and on the Windows 11 PC health check.
Rain Cleaner (Windows 10/11, 64-bit) shows what it found, with an explanation for each item, before it removes anything. The Free version has no ads; Pro has a free 14-day trial (no card). You can do everything above with Windows alone - Rain Cleaner is just another workflow.
Last updated: 2026-10-01
Not blindly. Temporary files and thumbnails are normally safe; Downloads, the Recycle Bin and a Previous Windows installation deserve a look first.
It frees disk space. It does not by itself make the processor, graphics card or internet faster.
Only when you need the space, or let Storage Sense do it with rules you have reviewed.
Built-in tools first, and what to check before you delete.
A practical order to check before you change anything.
A short, ordered checklist before you change anything.
Read the ID, understand it and search the maker's official page.
What each cleaner is built for, and who it fits.
Look first, back up, then remove - with Android's own tools.
Why they appear and how to remove them without losing a good shot.
Free, no account, no subscription. Windows 10 and 11.