rondeb wrote:
Well I put 5 gal of vinegar in both the gray and the black and 2 bags of ice in the black and we drove home. Didn't do anything. I so thought that vinegar would work LOL I'm going to let the tanks sit with the 5 gal of vinegar and about 6 gal of water in the tanks and see if anything cleans up.
When we leave in a few months, I'll find some tank cleaners as suggested above.
I use a tank additive called campa-chem from thetford. I don't normally use in the grey tank but I do occasionally add it to a 1/4 tank of clean water before a long drive. The product says is cleans the sensors, I have no idea if this is the reason my sensors still work but I guess it could be...