I've been adding channels using mgr-sync add channel [channel name] with no problem, but I added one that I don't want or need. Is there a way to uninstall/remove it ?

I thought mgr-sync delete channel [ channel name] would work but nope.

specifically I want to remove the sle11-sdk-sp3-pool-i586 & sle11-sdk-sp3-updates-i586 as we don't have any 32bit linux systems.