
A professional RV tank cleaning company gave me the best recipe to keep your black/grey tanks smelling nice AND preventing them from sticking (Calgon does this). In a 1-gallon jug or container of your choice, add 5 cups of Pine-Sol (we buy unbranded at the store for a dollar) and 1/2 cup of Calgon bath bombs. Slowly add water and let the foam settle. Fill the pitcher. Put the lid on and shake the jug slightly. After draining, add 1/2 cup to each storage tank and add some water as usual because every traveler knows not to let your storage tanks dry out. This product is cheap and works well. Finally, CLEARLY mark this jar so everyone knows it is not for consumption.

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