There are plenty of good ways to repair a scratched game. You need to get it refinished with professional machine. Chances are you don't own one of these thousand dollar machines, so just have a company do it for you.
Check out CDFixers.com
They will professionally refinish your disc for you and they guarantee their work.
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You can't really repair a scratched disk, or I have never come across a proper way of doing it myself. However you could try using hairspray/toothpaste to rub in to the back of the disk, wherever the scratches are. This sets in to the scratches and makes it easier for the lens to read them.
Just be sure to wipe the disk well before using it again. :)
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you can't you will have to buy another one because ps3 discs are always getting scratched if it was a wii disc you could repair it but ps3 discs you can't and ps3 sucks the wii is awsome even the ps2 is better than the ps3
Look at the game disc and make sure it is not scratched or dirty.
Bring it to your local game store and ask if they fix scratched disks.
try it
With care not to scratch the disc, if the disc is already scratched the cleaning will not help