I figured it was about time to pass this info on to others as I have gotten tired of seeing the same stupid methods being recommended all over the place. Whether its toothpaste, peanut butter, or some other household substance. No, what you want is a micro polish for vehicles. My recommendation is Menzerna SF4500, (use to be called PO85RD or micro polish). This stuff is expensive, at about $20-40 for 32-oz.. Its basically a micro polish with the finest grit you can get. Buy a yellow foam pad to apply the polish. Clean the disc, wet the pad, apply some drops of the polish to the disc, then go to town with the pad. It will get rid of minor disc scratches, while at the same time it will round off the sharp edges of deeper scratches. Using something to temporarily fill in the deeper scratches is up to you, but I think I would prefer to just smooth off the deeper scratches. So its pricey but it is what I think the best substance for bringing out a mirror surface on many other surfaces as well (since its marketed as a final polish for car paint). Its up to you if you want to get one of Menzerna's higher grit polishes to remove some of the deeper scratches, but larger grits will leave behind "swirl marks", while they may also remove too much of the discs surface.