Delete folders in user mailbox

I run Exchange 2010. I have the need to sometimes export a user account and delete all emails and folders from their mailbox. I know how to delete emails

New-MailboxExportRequest -Mailbox Administrator -FilePath "\\AZUA\Exports\Administrator.pst"

What i can't figure out how to do is delete user created folders in the mailbox. Can anyone help?

Thanks in advance.

Thanks for your help