Couple things I forgot to mention: If you want to clean one file then import those formats, you still need to delete all the tags from your other files first. Otherwise I think it will just add to the list, not scrub it.
Then either do the import or use the 'Create and apply formats' menu item in those files. And you might see a whole bunch of "Mapping Table <foo>" tags. Those are used on the Reference Pages, and you can safely delete them all. -Kristen Abbott