Commercial washing machines are designed to clean laundry, such as clothing, towels, and sheets. It is typically intended for more frequent and long-term usage than a standard consumer washing machine. Most commercial washers have a very sharp-edged square appearance, often with completely stainless steel exteriors to minimize rust and corrosion in a constantly moist environment. Often commercial washers are installed in long rows with a wide access passageway behind all the machines to allow maintenance without moving the heavy machine.