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What is an "acetone" bath and why would you do that to a coin? I as always told never attempt to clean them by my father...
Its a rinse in a substance called acetone ( very flammable, noxious stuff, use with care). It will remove any biological substance and some other gunks from a coin with out harming metal or oxidization (toning). It's very recommended for removing finger oils on coins. If you found a Nice red cent in circulation it most likely has some harmful substances that haven't done damage yet. Acetone will remove it with out hurting the coin.
Do a forum search for acetone and youll get lots of good info.