Most of what goes into the grey tank is dishwater with liquid Dawn detergent. When I drain the tank I am getting an enormous amount of suds, so much so that it fills up the dump station line. Has an...
I would say just a few slivers of bar soap down the drain. When I was a little kid my mom would make bubble bath for us with dish liquid. As soon as we introduced bar soap to the tub for the required scrubbing, the bubbles disappeared.