I don't know what simple green is made of but refrain from using anything alcohol based. While hand sanitizer and similar stuff (isoproanol) is great for stripping plastics and metal models, the finecast resin absorbs the solvent like a sponge, stripping away the paint but making the model rubberlike and extremely wobbly and thus prune to breaking. They revert back to normal after a couple weeks of drying. It takes quite some time for the material to settle again. Just as a warning, I learned it the hard way.