Zoids: How do I remove Acrylic ?

I recently purchased a Holo Tech Zaber Fang from the Zoids line of "action figure model kits" on clearance for $5. It is a robotic saber toothed tiger molded in semi-transparrent yellow plastic which at the time I considered as just a gimmic by Hasbro to rerelease an old mold and resell an old model. Anyway i began painting it with craft store acrylic paint to practice brush painting on larger areas and it was coming along nicely but now the model has made an appearance on the show as some sort of "stealth zoid" and I now wish to undo what i have started. I have only painted one leg, most of the head, and a body side panel. Is there a way to remove the paint without damaging the semi-transparent plastic [aside from scaping it off with a finger nail!LOL]?