Quick answer
Wiping free space overwrites unused disk space so remnants of previously deleted files are harder to recover; it is not routine cache cleanup.
By BleachBit.app Editorial Team · Published October 6, 2026 · Updated October 6, 2026
Cleanup versus wiping
Normal cleanup deletes selected files. Free-space wiping writes across unused capacity and can take much longer.
SSD considerations
Do not make repeated full free-space wiping a routine SSD maintenance task. Use it only for a clear purpose.
Before starting
Close unnecessary applications, confirm the correct drive, and allow sufficient time for the storage-intensive operation.
Frequently asked questions
Should I use Preview first?
Yes. Preview helps review the scope before data is removed.
Should every cleaner be enabled?
No. Select cleaners for a specific goal and only when you understand the data involved.
What after changing settings?
Run a small cleanup and verify normal Windows and application behavior before expanding the scope.