Remove Server from SSRS 2008 Scale Out Deployment

While migrating our SSRS environment to a new datacenter, we found this article helpful when needing to remove old instances from the scale-out-deployment, when original servers cannot be contacted (removed, inaccessible or re-purposed.)

http://milehighdba.blogspot.com/2011/06/remove-server-from-ssrs-scale-out.html