I can't and wouldn't try to expense a tip to housekeeping, and it is not listed in my companies tipping policy, so it would be coming right out of my pocket and into theirs. Since I spend a fair amount of time in hotels this would be a significant amount of money, even at the usual Hilton, Sheraton and Holiday Inn's I stay at. Not going to happen, I don't understand the constant need to tip everyone, but that's just me. I've never noticed any degradation in service if I didn't leave a tip, but then I am pretty neat and tidy and most times you can hardly tell I've been in the room, apart from a rumpled bedsheet and a used towel or 2.