I've found this to be effective, one for the first morning and one for the last... and leave $5 on the bed each morning.
No poop particles on the toothbrush, nothing missing, and everything clean and neat, every day. Hotel maids work hard, don't make shit, and most feedback is complaints, with many of them petty.
This hotel had a card to hang on the door if you wanted housekeeping to skip your room that day, unlike the "do not disturb" signs that cause knocking/phone calls, to see when. If you hung the card, for each day they'd give you a $5 credit for future services at any of their corporate hotels. Big whoop.