HP StorageWorks DLT80 Reference Manual page 53

Tape Drive Cleaning
When the cleaning cartridge has completed, the Operate Handle LED illuminates.
1. Lift the cartridge insert/release handle 1.
2. Remove the cartridge.
3. Lower the handle 3.
4. Record the use of cleaning cartridge by filling the check box on the cartridge
label.
Note: Discard the cleaning cartridge after 20 uses.
DLT80 Tape Drive Reference Guide 53