On the subject of the figures: I had pretty good luck cleaning a Romulan's tunic (tricky one to clean at best!) using mild dish soap and warm water. Still, there was a little residue that just wouldn't budge. Anything left after a good but gentle hand cleaning like that is going to be very tricky to remove, if it's possible at all. Best of luck on your injury recovery, and on your cleaning project. It's always good to see previously well-played figures getting new life.
Look what happens when you aren't allowed to play with "dolls"...
WANTED: partly-unsealed or bubble-damaged carded Romulan