I recently bought a vintage model that was pre-painted on the sprues. It wasn't the color scheme I wanted to go with so I researched some common types of paint strippers safe for styrene. For several years I've said to use Pine Sol and 50% water, but heard mixed reviews about it being safe for styrene. Doing a search, the miniature RPG guys say that LA's Totally Awesome General Purpose Cleaner works great. So I gave it a try. It is only $1.00 at most dollar stores in the U.S. In Canada ($3.