With System Center Virtual Machine Manager Update Rollup 5 there came some real cool features. One of my favorit is to deleted and manage Windows Server Hyper-V converged switch or how it is called in VMM standards switch.
Before you can see and work with the VM Switch your VMM environment musst be on Update Rollup 5 and VMM need a network connect to the Hyper-V Host for the whole time. So it might be neccessary to connect one NIC of the host to you management network.
First put the Mode in Maintance Mode
The easiest way to delete the converged switch is to open the Hyper-V Host properties.
Go to Virtual Switches
Now select the switch you want to delete and press delete
If all went well, the task in VMM should be green and your vNIC on the host should be removed.