Cadillac 2005 DeVille Owner's Manual page 221

The tape player should be cleaned regularly after every
50 hours of use. The radio may display CLEAN TAPE to
indicate that the tape player has been used for 50 hours
without resetting the tape clean timer. If this message
appears on the display, the cassette tape player needs to
be cleaned. It will still play tapes, but it should be cleaned
as soon as possible to prevent damage to the tapes and
player. If there is a reduction in sound quality, try a known
good cassette to see if the tape or the tape player is at
fault. If this other cassette has no improvement in sound
quality, clean the tape player.
For best results, use a scrubbing action, non-abrasive
cleaning cassette with pads which scrub the tape head as
the hubs of the cleaner cassette turn. The recommended
cleaning cassette is available through your dealer.
The broken tape detection feature of the cassette tape
player may identify the cleaning cassette as a damaged
tape, in error. To prevent the cleaning cassette from
being ejected, use the following steps:
1. Turn the ignition on.
2. Turn the radio off.
3. Press and hold the SOURCE button for two seconds.
The tape symbol on the display will flash three times.
4. Turn the radio on and insert the scrubbing action
cleaning cassette.
5. Eject the cleaning cassette after the manufacturer's
recommended cleaning time.
After the cleaning cassette is ejected, the broken
tape detection feature will be active again.
A non-scrubbing action, wet-type cleaner which uses a
cassette with a fabric belt to clean the tape head can be
used. This type of cleaning cassette will not eject on its
own. A non-scrubbing action cleaner may not clean as
thoroughly as the scrubbing type cleaner. The use of a
non-scrubbing action, dry-type cleaning cassette is not
recommended.
After the player is cleaned, press and hold the eject
button for five seconds to reset the CLEAN TAPE
indicator. The radio will display CLEAN TAPE MSG
CLEARED to show the indicator was reset.
Cassettes are subject to wear and the sound quality may
degrade over time. Always make sure the cassette tape
is in good condition before the tape player is serviced.
3-105