Undo ManagementRoleAssignment cmdlet?

I followed cmdlets that are required to get the GFI MailArchiver Mailbox Folder Structure Retrieval working with no problem. I was successful with their instructions.

However, one of "GFI's" techs said I could use anybody. So I chose a random user named say “Jane Doe” now “Jane” has administrative permission to all mailboxes. How do I reverse their commands so I can start over?

Their instructions show to do the following;

1. Run the following cmdlet:
   1. New-ManagementScope -name "MAUMPolling" -recipientrestrictionfilter {recipienttype -eq "UserMailbox"}
2. Once the above is complete, run the following cmdlet (the account used in this step cannot have domain administrator rights):
   1. New-ManagementRoleAssignment -name "MAUMPollingRA" -role:applicationimpersonation -user "masynch@domain.com" -customrecipientwritescope "MAUMpolling"

Example of what I ran: New-ManagementRoleAssignment -name "MAUMPollingRA" -role:applicationimpersonation -user "Jane.Doe@mydomain.com" -customrecipientwritescope "MAUMpolling"

Win2012/Ex2013 sp1

PennyM