I used to have the same problem until I discovered to use Happy Camper. It is the best thing you can use on the black and gray tanks. When you dump their are no solids, it will turn everything back into water and the smell is gone. I have not had any problems with the tank reading since I started using the stuff. You can get it through the internet.
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2002 Gulf Stream Scenic Cruiser
2018 Buick Envision Essence
Neway Freightliner chassis
Aventa II Blue Ox
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