For a few years after grad school, I worked as a housekeeper. Hard work, as you'd imagine, and strange. You're invisible, yet you have intimate knowledge of strangers. What they eat, when they last had sex, last went to the bathroom. Diaries, teeth in a glass.
Remember to tip, folks, and if you want to save someone's back, strip your bed. I've got a short piece up about the experience here at The Rumpus.