Clean up groupwise POA - data still big after delete account

Hi guys,

I migrated antest groupwise sytem from my production.

My POA data is too big (around 80GB) , so i deleted most of mailbox and keep only 10 mailboxes with small size.

but the POA data is still big ( around 80GB ) .

do you know why my POA data is too big after delete? or any step i missed?

or any command to purge my POA?

tks all.