About those pesky sensors...
The Missus and I have our own method of how to keep them functioning properly...
I wasn't going to share this........ I know EXACTLY how it will sound!
(Some background)
We travel with our five pound Pomeranian, and she does what all dogs do: she keeps us limber, by having us bending over to pick up her... debris!
The result of this, is that we always have a supply of "poop-bags" on hand.
Sooo...
We don't put anything but processed food and drink down into the black tank. Everything else goes into a bag, and is then taken to the nearest garbage receptacle.
This tactic won't work for everybody, and it will probably make a few of you nauseous
: but it has worked successfully for us for a number of years now.
...Just sayin'...