if you still want to use it try and see if the disc still works. if it doesn't work buy one of those machines that clear scratches if you have money otherwise you will have to throw the disc away and buy a new one.
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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
It must be scratched. You can get a someone to remove the scratch for you.... but, it's pretty expensive.
take the disk out and make sure it is clean and not too badly scratched
try it
With care not to scratch the disc, if the disc is already scratched the cleaning will not help