What is best chemical to use to clean up old silver sixpence? Coke, lemon juice and cillit bang just won't touch it at all.

Soak coin in distilled water & place in the freezer. The water will have gotten into the dirt and the ice crystals expand and break the dirt apart.
Updated on Friday, February 03 2012 at 02:00AM GMT
Collections: cillit bangice crystalsfreezerdirtlemon juice