Here is what I have found works. Just before leaving the site it dump the black water and use the black tank flush. Close the knife valve, put a 1/2 cup of dishwasher liquid in the toilet and add 2 to 3 gallons of water. After a day on the road the tanks is spotless and the level indicator works fine.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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