Quoted from Beez:Seems some of the machines I've seen that have a few good plays on it are beginning to look Foggy in the lower playfield
They just need to be cleaned on the underside. Mine gets nasty looking pretty quickly, especially near the flippers. It gets coated with a fine layer a black pin dust, presumably from the flipper mechs. The pin dust makes it look foggy. I just drop the lower playfield and polish up the underside of the insert with some Novus 1 and it looks great again for a few hundred games.