Dell OptiPlex SX270 User Manual page 40

2. With a soft, lint-free cloth, gently wipe the bottom of the disc (the unlabeled side) in a straight line from the center to the outer edge of the disc.
For stubborn dirt, try using water or a diluted solution of water and mild soap. You can also purchase commercial products that clean discs and provide some
protection from dust, fingerprints, and scratches. Cleaning products for CDs are safe to use on DVDs.
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