At my German hotel, you are asked to leave a sign on the door if you do not want your room cleaned for whatever reason. Cleaning the room is the default.
This is a good approach that is, unfortunately, disappearing in North America. Since COVID, hotels have become grimly opposed to cleaning rooms. Even during long stays of over a week, you often have to battle the unfriendly hotel receptionists to get the room cleaned. Many hotels have byzantine procedures for guests to request room cleaning. At one hotel, I was told that I had a short window of opportunity in the morning to put in my request. I was there for work and scheduled to, you know, work at that time, so I didn’t get a maid to come by even once during my stay.
Overall, the service industry in North America went downhill after COVID. Restaurants push QR codes at a person, forgetting that in lockdown people learned to cook and don’t go to restaurants just to eat. They go for ambiance, and if that sucks, they won’t come. Many restaurants went out of business in my town because there’s no demand for indifferent service and an absence of Norma menus.

