Pure acetone, with the emphasis on pure, is a coin-safe organic solvent. Depending upon the composition of the contaminant, acetone might dissolve it. Don't rub it or rinse it with anything. Just a quick dip to see if the spot dissolves and then let it air dry before putting it in a holder. Hardware stores are the most common place to find pure acetone. Look for 99% or higher. Follow all safety warnings.





















