Fixing scratched/dirty cd-r? Resurfacing?

[crazylegsryan]

I've been ordering SVCD through the mail and receiving them in paper sleaves. Some of these cds have read related errors when I try to make a copy of them (and watch them). I can see lines on the cd from where the sleave is folded. I've wondered before about how to clean cds and whether or not a resurfacing machine would actually work. I don't want to take a chance of completely ruining my cd.

Most of the cds are 80min 24x Gigastorage, but I have a scratched beyond recognition playstation disc also.

Optionally, anyone with an idea of how to repair the mpeg would help. I can't even copy them off the cd without an error.