Quoted from jibmums:Let's say I don't try for a deep clean to remove the ball swirl dirt, and just remove the grunge caked onto the playfield instead. How much harm is Naphtha and then Novus 2 going to cause?
Naphtha will remove the old wax, but not cause any harm.
Novus2 will sand off some of the topcoat, so be very careful.
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You will most likely be disappointed in any **polishing** of those old playfields.
Even when I have a NOS one come into the shop, that old lacquer topcoat is just too thin to really put a nice shine on. I've shined them up with a buffer, but it really makes all the graining stand out (some would say it looks worse).
I will gently suggest you clean with Naphtha, wax with a good paste wax and enjoy your games....