Try Castrol Super Clean. It's an automotive cleaner but I've used it many times to remove paint from models. It doesn't harm the plastic at all. I don't recall that I have ever tried it on clear parts though so you might want to try it on some clear scrap before getting a canopy in it. It doesn't create the noxious odors of oven cleaner and it won't dissolve anything it hits like brake fluid.
Here's a good site on paint stripping:
http://www.bonediggers.com/1-3/strip/strip.html
It covers all the common methods including Castrol Super Clean.