Janitors typically work for cleaning companies and commercial buildings like office parks, shopping malls, hospitals and other properties to perform cleaning tasks that daily workers can't. They usually work early in the morning or after business hours with a team of other maintenance personnel to perform maintenance chores throughout the building. Their job is to clean public restrooms, operate cleaning equipment like auto floor scrubbers and restock cleaning supplies as needed. They may also need to perform work to the exterior of the building, including washing windows, power washing walls or mowing lawns.