Experiencing false readings from your sensors, or a continuous odor from your black holding tank? If so, you most likely have residual waste buildup on your holding tank interior walls and level sensors. Using Commando® Black Holding Tank Cleaner will remove the odors and sensor buildup in as little as 12 hours. The super-concentrated, scientifically developed formula is filled with natural enzymes to penetrate the walls and sensors to break down waste and paper buildup in your black holding tank. Continued use of Commando every 3 months will help keep your tank in good working condition.