Can I safely delete Disk Volume with no backup sets?

I have an old Disk Volume that was used for some old backups jobs that are no longer needed. It's reporting 41TB, but I've expired all of the save sets and purged them with nsrim -X. Now the volume says no save sets, cleaning is running on the data domain, but the volume is still showing up as 41TB in the Networker Mgmt Console. What's the best practice to safely delete this volume?