This is a very high grade walker, I forgot about it in my collection and it became covered in PVC. I tried acetone to remove it, but it wont come off. Even with a Qtip it wont rub off. I dont think the coin is too far gone, or is it?
Acetone should completely remove PVC. Make sure you have good-quality acetone (should leave zero residue when you let some evaporate from a glass). Try a longer soak. You can gently poke at the spots with a toothpick but don't rub. If the surface has been corroded by PVC action it can't be fixed. One more option would be BadThad's Verdi-Care product. It is generally used on copper but is perfectly safe for silver.
All I can say is the Verdi-Care stuff looks like it works amazingly well on copper. You might want to give that a try before rubbing around too much. Let us know if it works (pics!).
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