I fixed a few of my disks with toothpaste. Don't rub in circles, but rub it the natural direction the disc is spinning. Don't just put a glob of toothpaste. Put a drop or two on a sock (a clean one) spread it out, then commence rubbing. Wash afterwards of course.
NOTE: Do not use toothpaste with whitening beads for it. They will destroy your disc.
NOTE: Do not use toothpaste with whitening beads for it. They will destroy your disc.