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To help keep the black and grey tanks less stinky we have used a good dish washer liquid such as Cascade etc. Not the packets but the liquid which we dilute in a bowl first and add to the tanks. In addition to degreasers it has wetting agents to help in the rinsing. Sort of accidentally discovered it when partial dry camping at the Winnebago factory and we had to conserve waste tank space. We washed dishes in a tub and poured into the toilet. When I did get to a dump station it seemed to help the flushing. Just our experiences.