Final answer:
When cleaning a treatment room, DHCP should wear 4) gloves, mask, and gown as personal protective equipment (PPE).
Step-by-step explanation:
When cleaning a treatment room, DHCP should wear gloves, mask, and gown as personal protective equipment (PPE). This is because these items protect against direct contact with pathogens and help prevent the spread of infectious diseases. The gloves protect the hands, the mask protects the mouth and nose, and the gown protects the body from exposure to potentially harmful substances.