The good news is that I have ALWAYS been able to clean affected discs no matter how long they have been so affected. I had discovered that some of my discs had turned foggy, or milky white, that I had not accessed in many, many years, yet I was able to clean them all and they work fine.
I used 91% isopropyl alcohol to clean them with great results. I have also read that the use of distilled white vinegar also works really well, but I have not personally tried this method.
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