Cleaning hospital walls and rooftops is essential for maintaining a sterile and safe environment. It helps prevent the buildup of dust, dirt, and pathogens that could lead to infections, especially in areas where patients with compromised immune systems are treated. Regular cleaning also ensures that surfaces remain visually clean and hygienic, contributing to the overall health and safety standards of the hospital. Additionally, proper maintenance of walls and rooftops prevents long-term damage, extending the lifespan of the building and ensuring compliance with health and safety regulations.