This may sound bizarre, but I put the disk with the silver side up in the toilet, and flush the water down through the middle hole Thing, and just dry it on something fluffy.
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With care not to scratch the disc, if the disc is already scratched the cleaning will not help
toothpaste
Yes, the Xbox 360 disc cleaner is actually designed to clean an Xbox 360 game disc and to clean the game system.
Most home remedies do not work. Since your disc is already unplayable it would not hurt to try anything on the disc that does not leave a film on the on game disc and dirty your disc reader lens. The best solution is to get the disc professionally polished.
you use window cleaner