HP 20/700 - Manual (Page 158)

Appendix A HP Ultrium Drives and Tape Cartridges 157
Appendix A
Using Ultrium Cleaning Cartridges
Only use appropriately formatted data cartridges and HP Ultrium cleaning
cartridges. In general, replace cleaning cartridges after fifteen uses. Marking
the label on the cleaning cartridge after each use will help you keep track of
the number of uses.
Caution Excessive use of the cleaning cartridge can cause unnecessary
wear on the drive head. The tape library operator panel will
display a message when the cleaning cartridge needs to be
replaced.
See Ultrium Cleaning Issues on page 159 for information on
troubleshooting common cleaning problems.