take muratic acid 1 part acid one part water. 50/50 dip cotton swab in it rub the dirt or whatever is on the coin. usually comes right off. then use the jewerly polishing cloth.
Coin dealer called them milk spots. a little muratic acid and anti-tarnish gold and silver polishing cloth. They are shining again. All is well. Finger prints are gone too.
the finger prints didn't deposit all white crap on them. I have others that don't have finger prints o them but they have the crap. need a way to remove it with minimal damage to the coin. any ideas? cuz they are worthless like they are.