You should be able to treat this just like any other spool file.
You can use EXPDATE & DAYS options on the printer file.
If the printer file name is constant you change just do a CHGPRTF,
Else, you will may need to go int CL programs and do OVRTPRT.
The above steps will put an expiration date on your spool files. Then you need to schedule running of the DLTEXPSPLF command to remove them once they are expired.
I just have that scheduled to run once a week on a Sunday morning.