I've had no luck with cheap commercial CD/DVD scratch removers. Tried most -- Memorex, Alera, etc. -- and none removed the kind of scratches i seem to get... What does work for me is using my two-speed grinder that i converted to a buffer to polish my pipes. If you don't have such a beast but have a drill press, buy a couple of mandrels and buffer wheel. I use the lower (1850 RPM) setting, use brown tripoli to remove the scratches then red rouge to remove the marks left by the tripoli. Hold the CD or DVD in the most natural way so that the buffing is radial. Five minutes and you're done.