Because of the nature of work, aunt cleaning is cleaning the toilet. In order to ensure the sanitation of men's and women's toilets, it is her job for aunt of the opposite sex to clean the men's toilets. However, auntie can't just go into the men's room. Before entering the men's room, she will stick a piece at the door of the men's room that says, cleaning. Please come back later. This is also a convenient way for men to enter the toilet, and it also avoids the inconvenience of men and women. Actually, before cleaning the men's room, my aunt won't wait for someone.