CCleaner doesn't work. It stopped in this position (0%) and doesn't complete his work. Why? What can I do?
Moved to CCleaner for Mac.
To start with try unticking 'Cache Internet' and see if CCleaner will then run for the rest.
If this is the first time you have used CCleaner then there may be a lot to clean which it taking time (or maybe confusing CCleaner).
Try an initial clearing of Safari cache and cookies using Safari itself, and then CCleaner should be able to do the job afterwards.
https://www.macworld.co.uk/how-to/mac-software/clear-safari-cache-3496193/