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What is the safe use of acetone? I thought cleaning my coins was verboten...
If you use the Search Tab at the top, you should find many, many posts about Acetone. Not sure why we don't have a separate Forum for Aceotone though since it comes up over and over and over.
Back to that coins problem. From what you already have read, Acetone will not do anything further than what has been done. Also, consider that since it is a 1939 Phily coin, over 6 million made, if those spots bother you, simply look for one in better shape. An MS-64 or 65 should be less than all the solutions you may end up using to fix that coin.
However, if you look closely you should see that some of the outer layer of Silver is now damaged in those places.
IF, your really in an experimental mood, a dip in that stuff for Silver Jewlery at
Walmart may help. HOWEVER, it also may ruin what is left.