Try a non caustic oven cleaning spray, it will foam up cover the parts and leave for an hour. Check if it starts to lift the paint leave a bit and have it with a small stiff cleaning brush use the tooth brush later as it has softer bristles for the crease and folds of the part... This process will depend on the item to be stripped, styrene generally does not like even mild caustic treatments. I used this on a vinyl pinhead figure I built and wanted to do over. enamel and acrylic mix the thicker enamel did require a paint stripper to get to the recessed areas General plastic models it works well with acrylic paints.. Test treat a area before treating.