I use straight acetone. The major ingredient in nail polish remover. You can get a can at Wal-Mart or pretty much any hardware store. Just use a q-tip or a cotton ball depending on what the job requires.

Edit:

I tried to find a good example of how well it works, this is the best I could find:

http://www.joedios.com/dioramas/sho...&imageuser=1397

I removed the brown paint from Stormy's tunic trim and sandals. Heck you could make an all white V2 with it if you wanted. But I will say be carefull with how much as it's literally death to paint apps. Also on harder plastics, such as torsos if you apply to much at once it will start to eat away at the plastic, but that's a worst case senario.

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