Recommend me a best duplicate photo cleaner for PC Windows 10

Disclosure first: I work on Duplicate Photo Finder at SoftOrbits, so weigh this accordingly.

You mentioned two problems with the free tools you tried, ads and scans that pull in pictures you don't care about, so on those two points:

• You choose which folders to scan. If you scan the whole drive, system folders are skipped, so app icons and cached thumbnails stay out of the results.
• It finds exact copies and visually similar shots (bursts, resized or re-saved copies), and you can set how close a match has to be.
• In each group it pre-selects the photo to keep and takes sharpness into account, so a blurry copy doesn't win over the good one. You can change any pick before deleting.
• It runs offline, nothing is uploaded, and there are no ads.
• It reads camera RAW files too.

The catch, to be upfront: the free version finds and shows all duplicates but deletes only a limited number per session. The paid version removes that limit.

Whatever you end up using, back up the library before the first big cleanup, as DashielQuinn suggested in this thread.