How do you fully remove a site from WMT?

Okay so it's pretty obvious how to delete a site from WMT, however even after deleting it I'm still receive messages about that site such as crawl errors etc. The site no longer shows up in my account but clearly it's still in there somewhere, is there a way to fully remove it?

Nothing you ever do on any Google system is ever deleted. They keep everything for who knows what purpose.