Quick answer
Use Preview to inspect what BleachBit plans to remove before cleaning, especially browser data, caches, logs, and application entries.
By BleachBit.app Editorial Team · Published October 6, 2026 · Updated October 6, 2026
What Preview tells you
Preview estimates which files match selected cleaners without deleting them. Use it to spot unexpectedly large or unfamiliar categories.
A safer sequence
Start with temporary files and caches, run Preview, inspect the largest groups, then add more cleaners only when their purpose is clear.
When to stop
If Preview lists active application data, saved sessions, or unfamiliar paths, deselect that cleaner and verify the data first.
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.