Remove old hosts

Remove old hosts

I have a few hosts that are no longer on my domain but when I go to add hosts there still on the list. These hosts are not on the domain and are no longer in AD; and even when I re-scan either the domain or complete, these are never removed. How can I remove old hosts from the add host list? If its not possible to do this individually, I would be fine deleting everything on the list and re-scanning as well. Is there a way to do this?
              New to ADManager Plus?

                New to ADSelfService Plus?