Anyway to delete all sketchy media from all Anking collection to free up storage?

I don't use sketchy and never had to scroll down to look at the fun images. Is there anyway to mass delete just the sketchy media for storage purposes? My anki folder is 13.65GB and I would like reduce the storage so that the collection would fit on my old android. I also don't sync AnKing updates, if that would be a potential issue. Thanks!