If a room isn't used for a period of time do you change the bedding before new guests check in? In other words, if you rent a room and then immediately clean the room and get it "guest ready" for the next renter, but then you have a long time between guests do you change the sheets again just so they are fresh? If so, how long is too long? A week, a month? Or if you know you are going into your slow period do you just not put sheets on the bed until the room is rented again?