When a disc is not being played, store it in its case to protect it from dust and other contamination. To prevent warpage, keep discs out of direct sunlight and extreme heat.
To clean a disc, use a clean soft cloth.
Wipe across the disc from the center to the outside edge.
A new disc may be rough on the inner and outer edges. The small plastic pieces causing this roughness can flake off and fall on the recording surface of the disc, causing skipping or other problems.
Remove these pieces by rubbing the inner and outer edges with the side of a pencil or pen.
Never try to insert foreign objects in the system or the magazine.

Handle a disc by its edges; never touch either surface. Do not place stabilizer rings or labels on the disc.
These, along with contamination from fingerprints, liquids, and felt-tip pens, can cause the disc to not play properly, or possibly jam in the drive.
Additional Information on Recommended Discs
Remote Audio Controls
Playing an Optional Audio Unit
Playing an Optional Audio Unit
Engine Block