Cadillac CTS 2008 Owner's Manual page 236

Care of Your CD and DVD-A Discs
If playing a CD or DVD-A disc, the sound quality can be
reduced due to disc quality, the method of recording,
the quality of the music that has been recorded, and the
way the disc has been handled. Handle them carefully.
Store disc(s) in their original cases or other protective
cases and away from direct sunlight and dust.
The CD/DVD-A player scans the bottom surface of
the disc. If the surface of a disc is damaged, such
as cracked, broken, or scratched, the disc may not play
properly or not at all. Do not touch the bottom side of
a disc while handling it; this could damage the surface.
Pick up discs by grasping the outer edges or the
edge of the hole and the outer edge.
If the surface of a disc is soiled, take a soft, lint free
cloth or dampen a clean, soft cloth in a mild, neutral
detergent solution mixed with water, and clean it.
Make sure the wiping process starts from the center
to the edge.
Care of Your CD or DVD-A Player
Do not add any label to a disc, it could get caught in the
CD/DVD-A player. If a disc is recorded on a personal
computer and a description label is needed, label the top
of the recorded disc with a marking pen.
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The use of disc lens cleaners for discs is not advised,
due to the risk of contaminating the lens of the disc
optics with lubricants internal to the CD/DVD-A player
mechanism.
Notice: If a label is added to a CD, or more than
one CD is inserted into the slot at a time, or an
attempt is made to play scratched or damaged CDs,
the CD player could be damaged. While using the
CD player, use only CDs in good condition without
any label, load one CD at a time, and keep the
CD player and the loading slot free of foreign
materials, liquids, and debris.
If an error displays, see "Disc Messages" later in this
section.
Playing an MP3/WMA Disc
Radios with the MP3 feature are capable of playing an
MP3/WMA CD-R or CD-RW disc. Radios with the
DVD Audio feature, are capable of playing MP3/WMA
on DVD+/-R discs. For more information, see Using
an MP3 on page 3-106 later in this section.