Well, there is one method I use on 1:10 scale R/C vehicle hard plastic bodies and will never go back to using strippers agian. The product is called Castrol Super Clean Degreaser, yes, a degreaser, not a stripper. It is strong enough to remove paint from bodies, but not strong enough to harm or fog the plastic. I have used this several times with great success. You can buy it at Walmart or possibly any automotive store where they sell degreasers. I paid about $6 for a gallon of the stuff and that's enough to strip thousands of Zip and Microsizer bodies. The best part about it is that it is not biodegradable, and it's 100% reusable!
Heres a link to more information on this, scroll down to the very bottom. He refers to the stuff as CSC (Castrol Super Clean)
http://www.bonediggers.com/1-3/strip/strip.html