Naptha isnt nuclear waste. Its a hydrocarbon distillate similar to kerosene and blended to make jet fuel. I make naptha. Ya its bad for you like any cleaning chemical, but not nuclear. Ive never used it on a playfield though, usually novous and a lot of elbow grease. (By the way, i figured you were joking about the nuclear part). And it is quite flammable, i wouldnt use it indoors!