I have been running some dupes tests with CCleaner & find it to be deeply flawed.
It starts out ok & does find duplicates ok on the first go-around. However, when you
check sub folders, it will show duplicates of files that already been deleted & it will
state that a folder has been completed even tho it is full of duplicate files.

These are all .mp3 files. For example, I have a sub folder under D;/ drive.
it contains mp3 files of a known polka artist. There two sets of files of this artist.
One is in all capital letters, the other is lower case. Both sets have the same files.

When I ran CCleaner the very first time on D:/ drive, it missed this sub folder
so in trying to do it over by excluding all but the one folder, it tells me that it is complete.
Even tho I do a reset of CCleaner, it keeps telling me that the folder is complete indicating
that there are no dupes in that folder.
At first, I was beginning to think that for dupe finding, CCleaner was the "cat's meow"
but now I have reservations about it. Surely, there ought to be something out there more reliable............