They make several kinds of CD repairers. If it's VERY light scratches, you can even try fixing it yourself by rubbing the CD very quickly in a straight back and forth motion on a pair of
blue jeans, turning it and rubbing again after about 20 rubs.
(pretend you're warming your hands on your jeans, but have the
CD in one hand)
I've gotten many of my ancient cd's working like that
It's a poor man's fix
Just if you go with a CD repairer, dont use the liquid brush on stuff.
Get an actual scratch remover kind that's a machine.
It turns the CD and grinds off a small portion of the plastic so poof!
I've gotten them to work on very deep scratches so whatever you do
if the CD is important, dont throw it away!