So we came across something that will clean the sensors great on accident.
We had to replace the seals on our black tank valve, and i really did NOT want to take a bath in any of "that" when i opened it up.
We picked one of these up,
Tank Rinser
It kind of works like a firefighting basement nozzle
(thats what we called it. Like a disco ball but instead of light its a stream of water pressure)
Plan was to just break up as much as possible to get it as clean as possible so a crappy job wasnt worse when i got in there.
Ended up pressure washing whatever was on the sensors right off and now they work 100%