1993 Honda Accord Owner's Manual - Page 86
1993 Honda Accord Manual
Page 86 highlights
Stereo Sound System (cont'd) Maintenance The head in the cassette tape player can pick up dirt or tape deposits each time a cassette is played. The result is low or "muddy" sound from one or both channels, as if the treble tone control were turned all the way down. To prevent this, you should periodically clean the head with a commercially available cleaning cassette. As preventive maintenance, clean the head about every 30 hours of use. If you wait until the head becomes very dirty (noticeably poor sound), it may not be possible to remove all deposits with a simple cleaning cassette. The use of 120 minute tapes is not recommended. CAUTION: Storing cassettes out of their cases, or touching the magnetic tape with your fingers will increase the amount of dirt that gets to the tape head. Using low-quality "off-brand" tape will increase the amount of tape deposits that get on the head. Both of these practices may eventually lead to damage of the head and playing mechanism.