How do you get paint off of colored dirt bike plastic, and not hurt the plastic.?

I just bought a side cover for an 81 xr100 Honda dirt bike(which are extremely hard to find), and someone did a terrible red paint job on it. How do I get the paint off with out hurting the red colored plastic underneath. I know there are auto paint strippers, but I know they will eat the plastic. Any one ever used any thing that works?