<< I used good old Break Cleaner. It melts all the goo off and then just hit it with some acetone to take off any of the resude. I got it to look just like it was new. Don't even need to use any force to take off any of the goop.
My 2 cents
Mike >>
If your brake cleaner doesn't say flammable, it's either 1,1,1-trichloroethane(low toxicity, very powerful, but bad for the ozone) or perchloroethylene(dry cleaning fluid. harmful and carcinogen, quite powerful, smells like a$$, safe for ozone). Obviously perc. is a ozone safe repl. for 1,1,1, TCE.
The flammable stuff is a mixture of various aromatic HC, aliphatic HC, ketones and alcohols.