Dawn dishwashing detergent, appropriate black and grey tank chemical deodorizer/cleaners, lots (and lots) of water, and black tank flushes after each camping trip, go a long way to help keep the black and grey tanks clean, and their associated sensors working properly. On our 2011 Cougar, following this regimen, all four (two black and two grey) tanks do not smell (other than what is to be expected) and all sensors are accurate. I suspect the key to keeping the tanks clean is lots, and lots, of water.
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