Still learning this lifestyle. After dumping the shit tank put several gallons of clear water so new droppings can be diluted. Unfortunately I was looking at an almost full tank that would not drain. Unfortunately the tank design had no way to get a plumbing snake to the drain tube. After looking at some youtubes that involved nasty ways of solving this issue from the drainside I found a product called the flush king. Went to camperland and bought one. It hooks up to the drain and has a stopper on one end and hooks to both the drain and the sewer tube with a water hose connection in the clear plastic middle. After several backflushes the brown sewer trout was flowing in the correct direction. Well worth the $40