darrExplorerJun 15, 2014porcelin toiletswe have a porcelin toilet in the rv....the little holes around the edge to let the water in get black and yucky...i clean it but it comes back...what is it and how to i keep it from coming back?
larry_barnhartExplorerJun 15, 2014We replaced ours a couple of years ago and the old one did the same. Kinda like it was mold. Maybe it was the az water as it is not good.chevman