BB TX gave the correct and simplest answer about flushing. WRT to cleaning the sensors, give it up. I've never found a solution that even partially works, and I've had several RVs. I've developed a sense of when to dump, except when teenagers are involved.
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2016 Montana 3711FL
2005 Ford F350, 6.0 diesel, short bed
Demco Hitchiker Auto Slide hitch
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