Cleaners and waxes to use, and the ones to avoid
Novus #2 cleans playfields and rubber, Novus #3 polishes metal, and a paste wax or hard carnauba wax protects the playfield. Do not use Wildcat products: they attack plastic, yellowing ramps and lifting mylar.
Systems
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part One, Clay Harrell (pinrepair.com)