Hi there. Take a look at this thread, replies 24,26.
http://forum.arcadecontrols.com/index.php?board=10%3baction=display%3bthreadid=17788I had gone thru more frustration trying to get to a bare metal control panel using all the techniques offered, wasting money on chemicals, sanding etc.
Finally someone suggested taking it to a machine shop. They baked it in the oven to burn off the crap encrusted on it and then ran it thru a machine called an abrader. I got back a clean, ready to paint or whatever cp within a few days. Look at reply #32 for a pic.
I would never try to remove any gunk from an old cp any other way again, personal preference of course.
If you decide to paint your bare cp, be sure to prime with a rustoleum type primer, let cure a day, paint a couple of coats gloss enamel and let cure a couple more days so the paint will harden.
Best of luck! ARCADIAC!