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Clean the disc. Even if a CD isn’t actually scratched or scuffed, dust, oil, and other surface contaminants can prevent it from playing properly. Thus cleaning the disc should always be your first move. Run warm water over the damaged disc to remove dust. If there is stubborn dirt or grease on the disc, gently rub it with your finger while you are washing it, and use a gentle detergent or liquid soap (with the water) or rubbing alcohol (in place of water). Any time you 'rub or wipe a CD, you should do so by starting at or near the center of the disc and rubbing straight outward toward the edge' to prevent further scratching. Shake the water off and let the disc air-dry (do not dry it with a towel or cloth, and don't sun-dry it either).

Try to play the disc. Many times a good cleaning is all that is needed. If, however, problems persist after cleaning, try to play the disc in a different CD player. Some players handle scratches better than others; computer CD drives tend to be best.

Burn a new disc. If you can get the CD to work in one CD player - especially your computer’s - but not in others, try burning a new disc. The CD burner on your computer may be able to read the CD well enough to produce a perfect copy. You may wish to try this even if the CD doesn’t play correctly on the computer.

Locate the scratch. Actually repairing the disc will be easier if you can figure out where the offending scratch is. Visually inspect the CD’s playing surface for scratches or scuffs. Scratches that run perpendicular to the CD’s spiral - that is, those that run generally from the center to the rim - may not affect playing at all, and in any case are generally less damaging than those that roughly follow the direction of the spiral. If there are several scratches, but the CD only skips in one or two places, you may be able to approximate the location of the offending scratches based on which track skips. Keep in mind that the first track of a CD begins near the center, and the direction of play proceeds outward to the edge.

Polish the CD. Though counterintuitive, polishing a disc can repair a scratched CD by removing some of the outer plastic coating and thus making existing scratches shallower. A number of common household products can be used to polish the CD, but toothpaste — especially baking soda toothpaste — and Brasso are probably the most tried and true. You can also use a fine-grit polishing compound that's used for cars or hard finishes. Apply a small amount of toothpaste (must be paste, not gel) or Brasso to a soft, clean, lint-free (old undershirt) cloth: an eyeglass-cleaning cloth works well. Gently rub the cloth on the scratch or scuff in a radial motion, start at the center and rub out to the edge (like spokes on a wheel). Do this 10 or 12 times all around the CD. Rubbing in a circular motion can cause small scratches that throw off the laser tracking system in the player. Try to focus your efforts solely on the scratch or scratches you’ve identified (if possible). Polish in this manner for a couple of minutes, reapplying Brasso or toothpaste to the cloth as necessary. Be careful not to apply much pressure, although you will still be able to feel the cloth gently scratching the CD as it polishes.

Remove polishing product from disc. If you used toothpaste, rinse the disc thoroughly with warm water and let dry. Make sure to remove all of the toothpaste and let the disc dry completely before trying to play it. With Brasso, wipe off excess product and let the rest dry. Then, using a clean cloth, gently wipe disc again.