Isopropyl Alcohol (Bunnings) and Magic Eraser (Supermarket) - especially if there is "ball swirl".
You could try a spot with ME and then another with Novus 2.
don't leave ANYTHING on a playfield overnight.
Would go even further by not leaving anything on the playfield longer that 5 minutes
Also be real careful with ME - don't just keep rubbing as they do have the habit of taking the 'gloss' of your playfield!
