1. To clean a DVD, use a soft dry cloth that produces no lint. 2. Clean bottom side of the DVD with straight strokes from the DVD's center to the outer rim only. Never clean a DVD with circular movements. 3. For stubborn dirt, use a solution of water with a little bit of detergent, wring out the cloth and clean the DVD as explained above. Use another dry cloth to dry. Don't ever use any cleaning liquid other than mild dish detergent or you might irreparably damage the DVD. Never clean the bar code area or get it wet or torn during the cleaning process.