DON'T CLEAN YOUR COINS - A Demonstration in Silver Dollar Destruction 

CoinWeek Sponsor and creator of The Coin Course, Jerry Shaffer teamed up with CoinWeek to produce this great step-by-step demonstration of what happens when you dip and clean vintage silver or gold coins.
To the untrained, the fastest way to damage a vintage coin and ruin its NUMISMATIC VALUE is to treat it or clean it with metal polish or other foreign substances.