Camco TST Grey RV Water Line Cleaner is a concentrated treatment designed to effectively remove grease buildup in your grey water tank, sink, and shower drain lines. Using just 4 ounces per 40 gallons, it eliminates foul odors and leaves behind a fresh lemon scent, ensuring your RV’s water system stays clean and odor-. This product comes in a convenient 32-ounce bottle, making it easy to use and store. Model Number: 40252