Quit rubbing random cleaners on the playfield. Order some novus1 and 2 the big bottles. Take it easy with the novus2 when using on the play field. Mainly use novus 1. You can only do so much to this playfield to make it better. Order a good wax like blitz. No cleaner wax! You can try novus 1 on the plastics. No reason to use it on the painted underside. The yellowing on the plastics might come of with novus1. If it doesn’t just live with it. No reason to use a razor blade. Your asking for damage if you do. Get it good enough play and enjoy!