The only place it puts the intermediate compile files in is the folder where your vmf is saved, along with the bsp, then copies the bsp to the game's maps folder.
Good, good. I've cleaned both of those. Thanks for info!
I got other files lying about in the my oc folder that I must have put in random places at random times by mistake. I'm gonna try tidy it up, maybe a fresh install once 1.3 comes
I find the easiest (and more importantly fastest) way to clean is to just delete the .bsp's, .vmt's and anything not .vmf's from your mapsrc folders. Seems to free up a lot of space every time i do it.