Question About PVC Damage

westcoin, what topic are you referring to?

You didn't say how much it costs for the coin.
To start with you could simply try soaking that coin in distilled water for a while. Now pending on how much you spent on that coin, to much spent on methods to remove that stuff may end up costing more than the coin is worth.
Now pending on what you have around the house, if you have some Acetone, try dipping that coin in there for a short time. Again, remember that if you don't have Acetone, driving to a store, purchasing Acetone may well already cost more than the coin. With todays prices on gas and a $5 can of Acetone, you'ld be off to an expesive start in cleaning up that coin.
If nothing to loose, do try the Olive Oil method of soaking for several days then again, you'll need Acetone to remove all the Olive Oil.
A sort of thing to do is check out the Search Tab at the top and try cleaning coins, coin cleaing, Acetone and other possible similar situations.
Still remembering that the more you do to that coin, the more it will probably be worth less and less.