I've done some extensive coin cleaning for experimentation purposes of the last 50 or so years. I've tried a variety of different pops and although Coke is pretty strong, so is Pepsi. Mountain Dew can't compare. I've also tried baking soda, battery acid, lemon and lime juieces as well as shaving cream, dish soap, Acetone, laquer thinner, mineral spirts, spit, laundry soaps, etc. Regarless of the method used it should always be noted that much of the substances on a coin that make it look not new are a coupound of the original coins material and an outside element. Example is the MYTH of the green stuff on copper coins being Verdigris or PVC when in fact it most likely is [CuCO3-Cu(OH)2] none as Copper Carbonate. Regardless, removing any such contaminate on a coin removes some of the original material of the coin and this is the primary reason for not cleaning a coin.
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Posted 10/22/2006 2:59 pm
But we won't mention my caffeine habit! 
