I need to be able to find domain controllers that have been removed from the domain but never demoted

I need to find domain controllers that have been removed but never demoted.
Here's the story...
I came on an Active Directory administrator for an organization which has 600+ domain controllers, most running Server 2003, but I have some Server 2008R2. Throughout all this time the organization has had DCs that have stopped working, crashed or failed
for some reason and all the IT department has done is created another domain controller name it the same thing with an (A), (B) appended to the name and then never removed any of the failed controllers from the directory.
Thing is this has been going on for quite some time, don’t know for sure how long as I am still trying to clean up DNS replication problems and have been having to go around and reset machine passwords for the forest. What I need to be able to do is to script
something that will return all the failed DCs so that I can go into the directory and use NTDUTIL to clean the machines. I don’t want to go into the directory and remove a machine that’s still out there. No one in the organization has a list or record of failed
machines.
You can see this may be a gargantuan task, but I need to be able to make it easier on 
myself by finding the machines first and cleaning out DNS, cleaning the DCs out of the “Sites” and cleaning them out of the directory.
Appreciate any help I can get…

Hi,
Thanks for posting in the forum.
Regarding your question, maybe we should remove these orphaned DC from AD, please try to refer to the following articles to perform the cleanup task.
How to remove completely orphaned Domain Controller
http://support.microsoft.com/kb/555846
Complete Step by Step to Remove an Orphaned Domain controller
http://msmvps.com/blogs/acefekay/archive/2010/10/05/complete-step-by-step-to-remove-an-orphaned-domain-controller.aspx
Metadata Cleanup of a Domain controller
http://sandeshdubey.wordpress.com/2011/10/12/metadata-cleanup-of-a-domain-controller/
Here is a similar thread as reference, hope it helps.
Remove References of a Failed DC/Domain
http://social.technet.microsoft.com/Forums/windowsserver/en-US/87516188-731a-4b7f-a4cc-06ce4ad27b19/remove-references-of-a-failed-dcdomain
Best Regards,
Andy Qi
TechNet Subscriber Support
If you are
TechNet Subscription user and have any feedback on our support quality, please send your feedback
here.
Andy Qi
TechNet Community Support

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