Clean up of /inst/client/.packages directory??

Doing a bit of housecleaning prior to upgrades... and I notice my master appliance (2.6.0.4) is probably a bit too full in the /inst filesystem to attempt an upgrade.  I look into it and see quite a few old client directories:

<master>:/inst/client/.packages # du -sk * | sort -n
978212  NetBackup_7.6.0.1_LinuxS_x86_64
1551296 NetBackup_7.6.0.1_Win
3481176 NetBackup_7.6.0.2_CLIENTS
3515036 NetBackup_7.6.0.4_CLIENTS
4053288 for_download
4530424 NetBackup_7.6.0.1_CLIENTS
10066360        from_dvd

Seems like I could get rid of a bunch of this... but was wondering if the clish provided a built-in method to do this already...