Solution
When the message "HEADS DIRTY, USE CLEANING CASSETTE" appears, when the playback picture becomes distorted, or if during playback of a tape recorded in HDV standard the picture and/or sound stops momentarily (about 0.5 seconds) the video heads need to be cleaned.
To maintain the best picture quality, we recommend cleaning the video heads frequently with the Canon DVM-CL Digital Video Head Cleaning Cassette or a commercially available dry cleaning cassette.
If the playback picture does not improve after cleaning the video heads it may indicate a malfunction. Consult a Canon Service Center.
Caution
Tapes already recorded with dirty video heads may not be played back correctly even after cleaning the video heads.
Do not use wet type cleaning cassettes as this may damage the camcorder.