Recently, I was gifted with the complete MacGyver set and 3/4 of it had damaged disks. Rubbing alcohol on a Q-tip worked very well on many of them. You have to be careful not to over do it but it did have some success. I didn't try regular non-whitening toothpaste, but when I was researching I came across lots of recommendations for it, and had people I know tell me that toothpaste is what they use. Good luck!
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