answer:You can send it through the mail citing all of the following or part: your confirmation number, date of stay, and room number. You can also in lieu of money write a letter about how happy you are with the cleanliness of the room to customer service if the hotel has a website. Actually, maybe cal the manager and ask directly the best way. Maybe they can put it on your credit card? Like restaurants do? Not sure. Pied_pfeffer worked in hotels for years, she would know I bet.