This is my 3rd class C ,so I am familiar with the normal ways to clean a grey water tank. But after driving 100 miles trying to get the empty tank to read empty not 2/3 full, used degreasers, put 20 gals of water and road 100 miles ect. I need to know what’s next. How do you check sensors in the tank without removing tank ?
Trying to fix those cheezy tank sensors can make your life a frustrating experience unless you can see the sensors and verify that the grounds are good and connections are tight. Other that that, they are nothing but a lifetime of trouble.
If you have to rely on sensors, get some goods ones, like SeeLevel.
Some people have tried a mixture of Dawn dishwashing detergent, and Calgon powder water softener. Fill your tank 3/4 full and put 1 cup of Dawn and 1 cup of the Calgon powder. Then take the rig over some curves to swish it around.Ive heard it works well but never tried myself.