Always clean CDs and DVDs with a soft, lint-free cloth, moving outward from the hub to the rim. You should always rest the disc on a firm surface with another soft lint free cloth underneath, this is especially important with dual-sided discs. NEVER clean it in a circular motion, as any scratches caused by the cleaning material are more lightly to be damaging to the disc. Don't be tempted to use strong household cleaners or any abrasives, as they will damage the disc. If the disc is badly scratched, you may want to try some of the commercially available CD repair kits that include a mild abrasive and polish. All repair kits labeled "For CDs" will work just as well on DVDs.