Good news! Got 1000 balls today (ebay purchase) and I've finally been able to confirm my machine is fully functional. Knocking down those jackpots -- and getting the payout!

So, I'm moving on to next phases of cleanup. The one area where I've shoelace-Brasso'd the nail heads is lookin pretty sweet. Once I get those done tonight I want to put in more time on the playfield/cell (terminology??). My initial cleaning was done with Windex on a q-tip, then I read something about the ammonia maybe being not so good for the cell. Bought some Simple Green today, but it doesn't show ingredients. Is it safe for cleaning playfield area? Should I dilute?