Dawn dish soap
We start a trip with 1 cup of Dawn dish soap in both the gray and black water tanks. The sloshing around while driving keeps the sensors clean and the odor away and it doesn’t foam up like other dish soaps.
We only use about 1/2 cup in the black water tank between tank empties while on the road, then a full cup once back home. No odor and ready to go for the next trip. Haven’t used deodorizer or tank cleaners in years.
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