DVD Handling and Cleaning
To avoid damaging or leaving fingerprints on the navigation DVD, always handle it by the edges and place it in a jewel case whenever it is outside the audio-navigation unit. Deep scratches or fingerprints on the back of the navigation DVD can cause intermittent rebooting or other system errors.
Smudges and fingerprints can be carefully removed using a mild cleaner and tissues designed to clean eyeglasses. To clean a navigation DVD, use a clean soft cloth. Very gently wipe across the navigation DVD from the center to the outside edge, never in a circular motion.
Do not place stabilizer rings or labels on the navigation DVD.