If you are trying hard to fix a badly scratched CD or DVD, just use toothpaste, it will work amazingly. This method is tried by many people. You will find all 398 answers for this problem here .
Some of most popular, interesting and easy ways to fix badly scratched cd came out as
1.Put toothpaste on the back, then put the CD under the hot water till all the toothpaste is out. It will sure fix the scratched CD.
2. Bought a “Game Dr.” at a store called E.B. Games. It resurfaces games, DVD’s, CD’s, etc.
3. Use furniture polish on CD, it does work and does no hurt the cd player.
Source Yahoo Answer