Quick answer
Custom cleanup rules should target precise disposable data, be tested before broad use, and be documented for later review.
By BleachBit.app Editorial Team · Published October 6, 2026 · Updated October 6, 2026
Define a precise target
Target a specific cache or temporary-data location rather than a broad user or application directory.
Validate safely
Test new rules against known sample files or a non-critical profile before using them on a primary account.
Document rules
Record what each rule removes and revalidate it after major application updates.
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.