I would suggest a lot longer than a quick dip to try to remove that gunk. Drop it in the acetone and forget about it for at least a day. To me it does look like PVC or the like. Give the acetone time to work on the gunk.
I was going to say the acetone will do nada for the coin...but then I noticed that the background paper towel is also blue...color balance might be an issue here and the blue I was keying on the coin might not be accurate.
Let's see what happens....I would try E-Z est after that (short dip)
the coin did not clean up at all in acetone, so I decided to rub it under water and most of the black came off haha! totally ruined coin, but an interesting experience :)
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