How many times does the waiter need to notify when he enters the guest room to clean up?

Attendants need to be notified 1 time when they enter the guest room for cleaning. According to the relevant public information, the waiter reminds the guests and tells them their identity. After knocking at the door, pay attention to whether there are any guests asking questions in the room. After five seconds, there is no answer in the room, so you can open the door with your room card. Hotel room attendants should not only provide services for guests, but also clean up. Cleaning includes several steps, such as window opening, cloth removal, bed making, toilet cleaning, disinfection, dust removal and floor absorption. Of course, hotel cleaning includes not only guest rooms, but also public areas, that is, public halls and corridors.