Description Clean up your tank with the Thetford Duo Tank Cleaner Concentrated. This concentrated cleaner provides thorough cleaning for waste-holding tanks and grey water tanks. There is no need to scrub as the high performing formula does the work for you. The formula tackles encrusting, grease deposits, built up scale and unpleasant odours. Keeping a clean and fresh tank is an effective way to prolong the life of your tank. How to Use Waste-Holding Tank: First pour 200ml into the empty tank. Next add 5L of luke warm water and then vigorously shake the tank. Grey Water Tank: First pour 600ml into the empty tank via the sink or shower drain. Next add in 50L of luke warm water. Drive your RV for at least 1 hour to mix the solution up and cover all surfaces of the tank. For Both Tanks: For a thorough clean, empty after at least 16 hours at a designated location.
