cleaning sensors in black water tank

Do you have one of those wands that you put down the toilet drain pipe? I use one about every second or third time I dump and my sensors stay clean. I have a "swivel stick" that has a brass nozzle that spins around and sprays everywhere. They have one with a flex hose on it for toilets that aren't mounted right on top of the black tank. They also sell a cheaper one that just has one fixed spray jet that you presumable twist all around inside the hole to clean all the sides and wash everything down. Finally, the tornado rinser seems like a good product. I bought one but haven't installed it yet. It's the same concept as the swivel stick but permanently mounted in the tank. The advantage is you don't have to drag a hose through the camper to use it. It has a piece of hose that mounts to a bracket and you just hook the water up to it right there on the outside of the camper. The down side is you can't twist it all around since it's mounted in the tank.

The other solution is to put several bags of ice down the toilet and drive it on a twisty bumpy road. The ice should slosh around and scrub the tank. Then use a rinser either every time you dump or maybe every other time to keep it clean.

Swivel Stick like mine but with a flexible extension

Tornado Rinser that you have to mount in the tank.

Cool video testing tank mounted rinsers by The Fit RV