How do I delete the unwanted Exchange Servers which are being displayed in Administrative groups under server

Recently due to my Exchange server (EX01) hanging I had to format it. Before Formatting I created new Exchange server (EX02) with a different name add it to the Administrative group and by default to the same routing group.
Once I format my real server and installed exchange again and renemed it to a new server (EX03) .

Thus Now I have Ex01, Ex02, Ex03 servers being displayed in my routing group inside members and also in servers in administrative groups.

I just want to keep EX03 which is only connected inj the network. Rest there are no servers.
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you need to install exchange on a server with the same name as the one you want to remove  using the disasterrecovery switch this will install exchange

then uninstall exchange and this will remove it from the org
the above comments are what you should've done. now that the damage is done, the only way to get the old servers out is to manually remove them from AD.
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