Ok, that sounds really simple, but the result appears very effective. I'm starting to see Isoprophyl alcohol having universal applications for pinball restoration. It was great at helping ,me get rid of residue mylar glue.
Fathom is a game I never knew about until I started visiting this site, but would love to own one now simply based on the playfield artwork alone. I'm guessing it's fun to play too?
Fathom is one of the best playing machines from any era. it is in my "Top 5 of all time". It was subject to being a "cookie cutter" SS for many years, as they are rare and have a stunning artwork package. I think Bally released a few great games between 1979-82 - Centaur, Fathom, Medusa, Eight Ball Deluxe and Viking.