[Q] Uninstall CWM? N7000B

Hi all

Hopefully I am posting this in the right place.
I am in the process of learning how to flash custom ROMs etc. My phone is currently rooted and I am thinking of installing CWM from ROM manager so that I can update to a newer Android version.
My understanding is that if I backup my stock ROM with CWM before I flash a custom ROM I can go back to my original ROM but the kernal / CWM recovery will remain
My main question is how do I "uninstall" CWM later if I wanted to return my phone to a stock warranty state. I believe that flashing a stock kernel will achieve this, however, I haven't been able to locate a procedure and the files specific to my phone's model (GT-N7000B, on 4.1.2).

Thanks in advance