Cleaning waste valves is almost fun August 31, 2009, 02:08:12 pm Yahoo Message Number: 105433I spray them with Amorall [same stuff some people put on tires] and let it dry. Dirt and crud dissolve without scrubbing. The whole valve assembly is bright and shiny.I have no connection with the product, but I sure wish I did.And you do remember to put some Vaseline on the valve itself about twice a year don't you?Again, I have no connection with the product, but if I did I would have a Kodiak in every western state and more airplanes than bumper.Cheers, Don