Would you use a 40% Phosphoric acid solution to spot clean your coins? Hello, Here is a link to a post on this board: http://www.cointalk.org/showthread.php?t=24826 Take a look please..It is a dental etching product of 40% phosphoric acid. Would any of you use this..EVER? Cheers
Make zure you put a nickel in with your pennies during the HCL soak, it speeds up the cleaning process.