Chug and Red...I am sorry to say but it is hard to recommend what is needed to possibly clean the coin up without knowing in what condition it is in! Hydrogen Peroxide, Lemon Juice and Vinegar if not used carefully, can pit Silver, Copper and Bronze coins. It is somewhat easy to remove bad/ugly toning on Silver coins (which should only be done to uncirculated Silver coins) but much harder to remove tough dirt, grime and encrustations from them without doing damage. If the coin is well circulated, my advice would be to bathe the coin in Acetone for 5 minutes, rinse with water, pat dry between the folds of a soft towel and then place the coin in Extra Virgin Olive Oil for a week up to a month or more. The Extra Virgin Olive Oil should help loosen some or all of the dirt, grime and encrustations from the coin. Remove once a week and with the coin still covered in the Extra Virgin Olive Oil, lightly rub it with a soft fingertip to see if any or all of the dirt, grime and encrustations is removable. If so, keep lightly rubbing the coin but ensure to dip it into the Extra Virgin Olive Oil ever so often to keep the surface lubricated but also to wash/rinse what is removed away. Once the coin is as good as it is going to get clean-wise, rinse with water, lightly wash in warm dish washing soap and water, rinse again with water, pat dry (do not rub) between the folds of a soft towel, air dry for awhile, then place the coin in a 2x2 coin protector.
Good luck!
Frank
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