Black and grey tank sensors

As previously mentioned, google the GEO method. Dawn dish soap and calgon water softener. Do this and drive to your next camp site and drain. It may take more than one cleaning but this method does work. I don't think driving around the block will be a long enough trip. I do this about twice a year and have no more issues with the sensors.
Blessings;Keith

Let us know what you did and if it worked.

After rinsing thoroughly, at end of season, I do a final fill (full), add liquid water softener, dump and rinse.

Thank you all for your comments and techniques. Always appreciate.

Roadrat57

I use one of the directional tank sprayers. Of course that will depend on where your sensors are in comparison to the toilet (straight down toilet only and it won't work with curved toilet drain pipe). Just point it toward the sensors and work it around. You can spray the walls in addition to the sensors. I also use 5 gallons of water and a good bit of Dawn before traveling to clean the inside of the tanks. Once or twice a year I'll use Calgon water softener (NOT Calgon bath oil) in the tanks (makes them slick so "stuff" won't stick to the walls.


One of these:

All depends on how brave you are to venture your arm and/or sprayer into the deep realms of the black tank. For me, ice down the toilet. A lot of it. Fill it 1/2 full then take it for a ride to hopefully break junk up off the sensor.

mccsix wrote:
3-4 oz of Dawn after every dump add water and the ride home keeps them clean and accurate on my 10 year old MH.

This is about the best I've found. I started working on motorhomes almost 22 years ago. This is about the easiest way to do it.

Ice really doesn't help much, it's 'materials' that are dried onto the sides of the tank at the sensors. Fill your tanks to about 2/3 or 3/4 full, and go for a 45 minute ride on a turning road, not the freeway. Dump, and if it's gonna help, it'll help then.