A. Once every few days or when I flood it.
B. When the draw becomes a little stiff or occationally when I do a drastic switch in flavor ie caramel/coffee to fruit, etc
C. I used to clean my attys every 2 days during that first week, then I moved to once a week, now I really only clean them once every two weeks or when blowing them out doesn't work well enough.
My method for cleaning...
Soak for like 15-20 min in iso, run the alcohol through the atty until it comes out in a nice stream. Then rinse several times with warm water and blow them out. Then dry burn, rinse with water again and dry burn again. No setting out to dry necessary! Basically I follow Highping's method, except with an intial iso soak.
Highping's method