If it has rained, I put my commuter in the big ring, big gear, and give it a bounce to shake off water, then wipe it down. I try and give the chain some attention once a week, and it only really needs a clean once a month maybe.
I have a bike I use for long days, or as a backup to my commuter and that gets a little more attention.
The fixie is weirdly my main commuter now, and it gets a wipe if I am adjusting it in some way - which is more often than I had anticipated for a fixed gear bike.
Edit: I was working in a far off office, which was in Paisley, and had no parking facilities - so I ended up having to take the (whichever) bike into the office - and I ended up taking a flannel and getting it nice and clean daily.