Reviving this old thread. Surprised there isn't more reviews of this product on Pinside (or the internet for that matter). I just bought some of this and used to clean my WH20 playfield. ( http://www.marcospecialties.com/pinball-parts/CP-100 ).
It really seemed to work great, but maybe a little too good. Now the ball plays faster than a greased turd. I noticed on the bottle it says it is petroleum based. Any issue with this? Anyone else use this product to clean pf specifically?