Clean the disc carefully using a solution of liquid dish soap and water, applying the solution with a damp cloth in a direct motion from the center of the disc to the outside. Dry with a clean, dry cloth in a similar motion, or allow the disc to air dry in an area out of direct sunlight.
Purchase a commercial CD/DVD disc repair kit, and place the faulty disc in the cleaning apparatus. Follow the instructions provided to repair the disc. Commercial disc repair kits do not always work, but they are the cleaning and repairing method that is least likely to cause more damage to the disc, and should be used first whenever possible.
Apply a small amount of liquid car wax to the scratched area, and allow the wax to dry until it is hazy rather than wet in appearance. Gently buff the area by rubbing it softly back and forth with a clean cloth, working from the center of the disc to the outside, avoiding a circular motion.
Apply non-gel toothpaste that does not have excessive whitening ingredients to the disc in small amounts near the scratched area. Gently buff out the toothpaste with a clean, soft cloth, working from the inside to the outside, avoiding buffing in a circular motion.
Wipe the inside of a banana peel around the surface of the disc. Dry the disk using a soft, dry cloth and wiping from the center of the disc in a direct motion to the outside.