Sensors are always going to be in harms way on every trip. TP is not friendly to start with. Check out YouTube on same subject. We dump old fashioned Borax into 5 gal of water, mix and dump into toilet. Add 1/3-1/2 tank of water into black tank. Do similar into grey tank with a bit of Dawn for grease buildup. Add 1/3-1/2 tank of water into grey tank.
Close up, batten down and hit the road letting the water in the tanks slosh around well. Dump both tanks, flush both again; dump again and finish off by adding 1/3-1/2 water to both.
Watch YouTube for best guidance. Works pretty darn good and is great for odors too instead of dumping deodorant into the black tank.
Look up SeaLevel II units that have exterior strips in %
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