A commercial cleaner brings a carpet cleaner, floor waxer, and other equipment into a place of business. In this role, you come in as a contractor and perform duties such as cleaning, mopping, sweeping, window washing, and power-washing the exterior of the facility. Some commercial cleaners focus on specific types of tasks which require specific qualifications, but there is a significant demand for generalized cleaners as well. However, if you want to build a long-term career in cleaning service, you should pursue a niche or specialty. Some cleaning companies offer basic maintenance services.