Hey uilebheist, two words..Simple Green. This will disolve the paint off. You can buy this stuff at any auto parts store for $4-$5.00 a gallon. Just soak the model in a bucket. It might start to disolve in hours or a few days. Remember the paint been on over twenty years, and i'm really sure this stuff will work. Also i'ts safe to use, not like oven cleaners
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Good luck