Cleaning Arcade Romsets
“Non-merged” Arcade Romsets contain many clone Roms as well as Roms belonging to genres/categories that you don't want to keep.
This cleaning is to be done on a system that does not have a gamelist.xml and it must be done before launching the scrape of the Roms, in order not to recover the media of the Roms that you will finally delete.
This video shows you how to remove:
You can also check: Filter Arcade clones