Yes Lacquer thinner is the best and most commonly available product, we use it in the shop for degreasing guns and cleaning spray paints off before sandblasting. Let the receiver soak in a metal tub for awhile and use a soft quality plastic brush(toothbrush works but small) to scrub the tight spots out. If yo uare to clean any plastics with it test a small area first, for example HK (G3's,Mp5) plastic will melt like butter in seconds when touched buy lacquer thinner.