What should I use to clean silver coins, such as the ones attached? Distilled water and let them dry? Is it scratch-safe to rub them with any sort of cloth? I assume the green is verd gris from the copper content. I do not know what the brown deposits on the Mexican coin are. Thank you!
Looks like it might be "Green Slime" from PVC holders. Many times the residue will feel tacky. Soak/swab with Acetone. There are a number of threads on Coin Talk with info on how to do this> Assuming it's green slime, you need to remove it. The residue is acidic and will damage your coins
