When I get a new machine home, it first gets a wipe down with Windex or 409 and paper towels to get the nasty black gunk that seems to collect on all arcade machines.
Once inside, I'll clean the side art with Windex, the control panel with 409, and if it has stubborn dirt in the vinyl, I'll use a couple of Magic Erasers.
For plexi or glass, Windex and a soft cloth.
For rust, a Dremel with a wire bristle wheel, followed by a polishing felt with rouge if it's chrome/steel or paint if needed. Then a coating of CLP on bare metal parts to protect them.
To get the ^%#@ auction stickers off, I spray it with Goo Gone and leave it for about 10 minutes.