I use oven cleaner, Easy-Off, with no ill effects to the material. I use it for all model paint stripping, whether plastic, metal or resin.
I use it in a well-ventilated area, since the active ingredient is lye, and I wear household work gloves to hold the piece. I put the figure in an old glass round baking dish, spray the cleaner on it until it's covered in foam, let it work for a couple of minutes, then start scrubbing, gently, with an old toothbrush. The foam will start to color as it dissolves the paint, which is another indication that it's working.
I keep a bowl of water on hand, and dunk the figure in water to remove the foam, and repeat the process as necessary. For paint that sits in engraved detail/relief, I'll use toothpicks, pins or old dental tools to scrape it away, being careful about removing the material.
Scott Girvan (Scale Model Addict) has demonstrated using oven cleaner sprayed into a sandwich bag, for a small figure (around 1/48). Then it was just like Shake 'n' Bake. I like that idea, but haven't tried it yet.
Hope that helps!
Regards,
Brad