I thought I looked real hard at the other toilets (which are white). I didnt see the scum in them. Maybe Im not looking hard enough. Ill chech again. Do you know of any water treatment to stop this residue? Thanks.: It is a residue from the water. It is normal with balck fixtures. When you bought them, you acquired a lifetime of cleaning.: : I have a Kohler toilet. The china color is black regularly days after cleaning collects a white scum below the surface of the water. Other toilets in the house dont have this problem. Cleaning is not too difficult except hard to reach areas. What might the cause of this?
