Best practise to remove and old GC from 2012 Server AD

We upgraded an old 2003 server to 2012 but before we dcpromoed the old server out the network someone came up with a use for it. Long and short of it it never got used and never got turned back on. When I did get round to it the server had been too long away from the domain and wont log back on anymore. We don't want to use it just would like best practise to remove manually?
grovenetsupportAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
you will need to do metadata cleanup since it is beyond the tombstone lifetime

Clean Up Server Metadata
https://technet.microsoft.com/en-us/library/Cc816907(v=WS.10).aspx

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Windows Server 2012

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