I'm thinking about sanitizing the water tanks in my trailer and topper. The only way I can see to access the tanks is through the filler pipe. I've thought about draining the tanks and hooking up my WysiWasher to the pipe that you fill the tank with, filling the tanks and letting them sit for a couple hours, then draining and filling with fresh water and probably filling them and draining them 2 or 3 times. Anyone ever do that or have any other idea to sanitize the tanks?