I tip $1-3 day depending on the service. I factor in things like how clean the room was when we get there as well as how it is each day. Lately I've been leaving the do not disturb sign out and just straightening up myself in any of the hotels that insist on changing the sheets daily and putting out all fresh towels - it's so wasteful. I really prefer the ones who just change the bed every 3 days and that leave the towels that you hang up. It's what I'd do at home anyway....