Apologies if there's already a way to do this that I missed... but one feature I'd like to see in a future version is the ability to exclude/protect specific files in a directory that is being cleaned out.
For example: my scanner driver insists on storing its calibration files in the user's temporary file folder, and there's no way I can get it to save them somewhere else. So when I use CCleaner to clear out the temporary files, it means the scanner has to re-calibrate. It would be great if I could just enter those filenames into a special "Exclude" list so CCleaner would keep them and clean out everything else.