To calibrate the holding tank monitors in your RV, follow the steps outlined in our video: ... We’d suggest closing the valve and filling the tank with water and an extra heavy dose of Happy Campers Extreme Clean and let it soak for a couple of days. DIRECTIONS: Much like clothes in a washing machine, rinsing & agitation does most of the work, EXTREME CLEANER simply softens & helps dissolve sludge & crud in holding tanks. Quick view. ... How to clean RV holding tanks? Qty: Get In-Stock Alert. As boondockers, we like to have as much capacity in our waste tanks as possible. Happy Campers Organic RV Holding Tank Treatment We started out using the Drop-Ins in our RV black tanks and sometimes our gray tanks. Add to cart Details. RV Campers All Natural Easy Light Organic Fatwood Fire Starter Sticks - 3 Boxes Start 36+ Fires. EXTREME CLEANER by Happy Campers - RV & Marine Extreme Tank & Sensor Cleaner. It is safe, clean, easy to use and not chemically sensitive. Happy Campers and Healthy Boater products are designed to totally eliminate odor in RV’s and Marine holding tanks, by using a 100% organic, environmentally friendly product that is guaranteed to ensure comfort, ease, and confidence to … (Each Happy Camper Extreme Cleaner Container is 1 Treatment). $44.45. EXTREME CLEANER for RV & Marine black/gray waste holding tanks:USES:1) Cleans poor working sensors.2) Softens & removes solid buildup.3) If your present tank treatment has quit working.4) You just bought your RV & want to super clean the tanks for a fresh start.5) A great product for an Extreme Cleaner is designed to clean and remove all types of waste, tissue, soap and scum buildup from both black and grey tanks. ... We have used a range of different products over several years designed for RV holding tanks and have always had problems with odours. Cleaning gray water holding tanks when hooked to full hookups: Empty gray holding tank and close tank Then mix a double dose of Happy Campers Tank Treatment and a gallon of water. Tips For Tanks; Blog; Contact; Sort by Default Order. Quick view. Buy Happy Campers Holding Tank Treatment - The All Natural, All Organic, 100% Effective RV Holding Tank Treatment That Eliminates Odors Guaranteed! Buy happy campers extreme cleaner for holding tanks at Walmart.com. ... Be the first to review “Happy Campers Organic RV Holding Tank Treatment” Cancel reply. Happy Campers Organic RV Holding Tank Treatment Cleaner – 40 Treatments $ 34.45 $ 33.45. If this should ever happen to you please read and follow all instructions for using Extreme Cleaner. $27.45 . 45 $28.45 $ 28. 4) You just bought your RV & want to super clean the tanks for a fresh start.