No machine can fix scratches that take away data. I have not had to send mine off for fixing, using the OTC methods noted above. Your local DVD rental place has a machine that fixes rental DVDs. They are expensive but effective and they may be helpful to you. Another way to go is to use Exact Audio Copy to burn a new copy, unless of course it won't play at all. I have used it on CDs that skip and because it continues to sample the music many times during error-checking, it has reconstructed the data that wouldn't play on a standard player. The new CD sounds better than the old one even when it was new, according to some including myself. Good luck.
CD Repair?
I've seen several companies advertising CD repair by polishing out scratches. Here's a couple of examples: www.wefixcds.com & www.auraltech.com.
Has anyone had any CDs repaired? Successful? Worth the cost? Thanks!