Commercial cleaners are responsible for cleaning and maintaining commercial and industrial facilities, such as offices, warehouses, and retail stores. They perform a variety of cleaning tasks, including sweeping, mopping, vacuuming, and dusting, and may also be responsible for emptying trash receptacles, cleaning restrooms, and restocking supplies. To become a commercial cleaner, you can start by obtaining a high school diploma or GED, and then apply for entry-level positions with cleaning companies or building maintenance departments. You may also need to complete on-the-job training and obtain certification in cleaning and sanitation.