Unable to remove a disabled account from permission on a Resource account

I have an "Equipment" resource account.  I see a listing of users with Access Rights when I runget-mailboxfolderpermission engcalendar:\calendar.  I see "Joe Doe" as having Editor permission.

[PS] C:\Windows\system32>get-mailboxfolderpermission engcalendar:\calendar

FolderName           User                 AccessRights
----------           ----                 ------------
Calendar             Default              {Reviewer}
Calendar             xxxxxx              {Editor}
Calendar             xxxxxxxx           {Editor}
Calendar             xxxxxxxxx         {Owner}
Calendar             xxxxxxxxxxxxx  {Editor}
Calendar             Joe Doe             {Editor}

When I try to remove his account I get an error message.

[PS] C:\Windows\system32>remove-mailboxfolderpermission engcalendar:\calendar -user doej

Confirm
Are you sure you want to perform this action?
Removing mailbox folder permission on "engcalendar:\calendar" for user "doej".
[Y] Yes  [A] Yes to All  [N] No  [L] No to All  [?] Help (default is "Y"): y
There is no existing permission entry found for user: doej.
    + CategoryInfo          : NotSpecified: (:) [Remove-MailboxFolderPermission], UserNotFoundInPermissionEntryExcepti
   on
    + FullyQualifiedErrorId : [Server=MAIL2013,RequestId=d6a776c6-fdf6-4cb1-ac8a-db4f1ebfe60e,TimeStamp=6/1/2015 9:23:
   18 PM] [FailureCategory=Cmdlet-UserNotFoundInPermissionEntryException] 4976BF05,Microsoft.Exchange.Management.Stor
  eTasks.RemoveMailboxFolderPermission
    + PSComputerName        : mail2013.usa.org

Joe Doe's mailbox was disabled 4 months ago and his AD account was renamed and disabled, but yet he is listed as being an editor with his original name.  How can I get rid of him?  He is not a delegate on this mailbox, just has Editor privs, but yet is still getting delegate requests as well.

Any ideas?

Thanks

Sally