Hi Martin!
Enter the following entry:
checkin libvol 3570lib clnxxx search=no status=cleaner cleanings=100
TSM will issue the following messages:

07/12/2000 15:44:34 ANR8422I CHECKIN LIBVOLUME: Operation for library
3575LIB-R1 started as process 1.

07/12/2000 15:44:38 ANR8323I 001: Insert 3570 volume CLNxxx R/W into
entry/exit port of library 3575LIB within 60 minute(s); issue 'REPLY' along
with t he request ID when ready.

Insert the cleaner tape in the left I/O port and reply with REPLY nn where
nn is the request ID.
This will checkin the cleaner tape.
Kindest regards,
Eric van Loon