[sim099]

I used the vanilla library clean, nothing happened. I have installed this add on 6.1 (i think?) I hit clean and it just opened up the vanilla library cleaner again and after about 20+ minutes nothing happened.

 
Kodi's "Clean Library" option (under the settings) should do exactly what you're describing.

For example, adding "Movie/Movie.mkv" and then renaming it to "Movie (2021)/Movie (2021).mkv" and re-scanning would result in the movie being displayed twice. Deleting "Movie (2021)/Movie (2021).mkv" would obviously result in neither of those entries being useable because the filles they point to don't exist.

The "Clean Library" function checks all entries in the database to make sure that the referenced file is still available, removing that entry from the database if not. That's how it works as far as I understand it from my usage anyway, I haven't confirned that in the code.

The dupes don't concern me because if I can clean the entire library of movies that aren't connected to a source any more then it'll fix that problem as well. That's what I'm looking to do in the end. Basically I just want every movie that isn't on a source gone. Hell I can taken out all sources, it's just 2 hdd and delete the entire list and repopulate it if that's easier. Just can't figure out how to get rid of the initial list

Weren't you asking how to get rid of the duplicates? "Clean Library" should do that as long as the duplicates don't remain on the source(s) (i.e. you've deleted "Movie/Movie.mkv" in the example above meaning that Kodi no longer finds it).

If you just want to remove everything from your library then I'm pretty sure that if you begin to remove a source, you'll be asked if you want to remove everything under that source from the database.