You're free to experiment with harsh chemicals (it's your coin!), but I don't believe anything "gentle" or "safe" (as acetone is generally accepted to be) is going to help. Do a search on previous threads. There have been some extensive conversations on cleaning in the past month or so, and I don't think people are too keep on repeating themselves so soon.
Synopsis, try acid or ammonia and take precautions for your health.
Synopsis, try acid or ammonia and take precautions for your health.


















