Steve, I ran into this problem when I was painting my walker head. A friend of mine recomended me to soak the entire resin head in "Mr Muscle oven cleaner" foam. I let soak in it for 24 hours and then all I had to do was to shower it with water! Everything came of in an second, you can also help it on it's way with a tooth brush.
The resin was completly un harmed and my friend toold me this was an old tank builder trick.
Try it man, I'll bet you'll be surprised how well it works!
Hey, you guys might want to stay away from the brake fluid... I tried that with a resin '66 batmobile body and it took a year for the resin to firm back up again afterwards. It turned the body flexible and rubbery and actually ate through in some spots - the body was completely ruined.
I use Easy Off oven cleaner. Place the parts in a ziplock back, spray liberally with Easy Off and then close up the bag and let it sit for a while (I wait over night). Scrub with an old toothbrush to get in the panel lines and corners and such. Sometimes a second application is called for, but I've never had a problem with damage to the resin.
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Does the oven cleaner work on styrene plastic too? How does it do with enamel paints?