A drain cleaner, also known as a drain opener, is a person, device, or product used to unblock sewer pipes or clear clogged wastewater drains. This term typically applies to chemical, enzymatic, and mechanical tools such as commercial chemical cleaners, plumber's snakes, drain augers, bio-enzyme solutions, or toilet plungers. In some contexts, it may also refer to a plumber or professional who specializes in drain cleaning and maintenance.