Most cleanup regrets come from deleting something before checking what it was. Five small habits make a cleanup safe, whatever tool you use.
Copy documents, photos and project files to an external drive or cloud storage. A cleanup should never be the only thing standing between you and a lost file.
If System Protection is on, open Control Panel → System → System Protection and choose Create. A restore point helps with system settings and drivers; it is not a backup of your personal files.
Read what each category contains before you tick it. Windows lists temporary files, update data and old installations separately for a reason: some are always safe, some change what you can undo.
Files inside the Windows, System32 and WinSxS folders, and hiberfil.sys, pagefile.sys and swapfile.sys, are managed by Windows. Use supported tools instead of File Explorer for these.
Move rarely used large files to an external drive before deleting them. Keep the Recycle Bin until you are sure. If a tool offers an undo or history, use it.
Rain Cleaner (Windows 10/11, 64-bit) shows what it found, with an explanation for each item, before it removes anything, and keeps a history of what it did; Pro can undo supported changes. The Free version has no ads; Pro has a free 14-day trial (no card).
Last updated: 2026-10-03
No. A restore point covers system files, settings and drivers. Your documents and photos need a separate backup.
Anything inside the Windows, System32 and WinSxS folders, and hiberfil.sys, pagefile.sys and swapfile.sys. Use supported tools for these.
Because the same category can hold disposable files and files you still need. Reading first avoids irreversible mistakes.
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.
What is safe to remove, and what needs a second look.
What it removes, what you lose, and when to use it.
Why it looks so big, and the safe ways to shrink it.
What it holds, what you lose, and the supported way to remove it.
What the cache is and how to clear it with Windows tools.
A sensible order for network, chipset, storage, graphics and more.
Add one driver or a whole folder from the command line.
Look first, back up, then remove - with Android's own tools.
Why they appear and how to remove them without losing a good shot.
Rain Cleaner: review before cleanup, free version, 14-day Pro trial.
Hash check, Defender scan and the SmartScreen steps.
How to report a security issue privately.
What we are working on now, next and later.
A safe order of checks: df, inodes, du, open deleted files, logs, packages and Docker.
Check the size, vacuum it once, and set a permanent limit.
Four built-in ways to see what is taking the space, before you delete anything.
Every disk-cleanup question in one place, with a safe order of checks.
Nine steps in a safe order, printable.
What they are, how to shrink them safely and what not to touch.
Free, no account, no subscription. Windows 10 and 11.