How to remove orphan service?

We have a service that was originally part of a stack.

That stack has since disappeared, but this one service remains.

Deletion by normal means is not working.

Thankfully it is not in production and is not obviously affecting the operation of new stacks with the same named service within.

The following log message is repeated continuously.

06/04/2018 17:16:53Waiting for metadata self service

Rancher will restart the service regularly as well.

How to remove?