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How do i remove a DC without it being on my domain

Medium Priority
Last Modified: 2016-02-19
I need to remove 2 DC's from my Domain these server have not replicated with the other 2 for quite some time. Now the servers are not connected to the existing domain but i want to remove them from my domain how do i do this and what will the implications be if any?

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if they are not primary dc's and they do not hold any databses, or any other roles (DNS, DHCP, Print Server, File server) I assume they can be removed without a scratch.
Do the servers have any connectivity to the other DCs?  If so, it is best to migrate the FSMO roles while they are up.  If not, then brittony's link is right on the money.  You need to make sure those DCs are not hosting any FSMO roles and transfer them to the remaining DCs.  I suspect your disconnected DCs don't have any FSMO roles, or you would likely have seen some issues in operations by now.
Is seflw01 one of the decommissioned servers?  If so, is one of the two remaining DCs are GC server?  You need at least one GC.  You can make one (or both) of your remaining DCs into a GC server.  

If the NTDS settings for the server you are trying to make into a GC server already has the Global Catalog box checked, then it is already a GC server.  You can check GC replication thusly:
remove the servers from the sites and services console in the replication options.

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Do you mean remove the servers that are decomissioned because i have. The only 2 in there now are the servers that i am left with which next to each other on same site.
These to servers are both GC's and one is the operations master and has the FSMO roles

In sites and services under NTDS settings i get aload of random letters and numbers then the server and says default first site name

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