I picked up a NGG a month ago and while shopping it out I notice this stuff on the playfield. I don't know if it is clear or epoxy or what but it doesn't come off.
You can see some on a sling plastic and I can see smears of this stuff on other plastics and other parts of the playfield as well.
It's not noticeable from a distance but I'm getting close to this stuff and I'm saying to myself WTF?
Any ideas?