At home in the unheated garage. At work, outside in the weather. Granted, we don't get much snow (I won't ride in it, I don't trust the drivers) and no salt is used to remove ice. Mostly lots of water and road grime - the road grime is almost the consistency of jeweler's rouge, really fine and gritty. I probably don't bathe the bike as often as I should.

Can't logically see storing it inside during the work day - it gets crappy on the way in and on the way home, sitting in the rain probably is good for it...