What Causes Grey Stains in Toilet Bowl and How to Remove Them
What Causes Grey Stains in Toilet Bowl? Grey stains in a toilet bowl can be caused by limescale, bacteria, mold, and mildew. Limescale, which is a mineral deposit from hard water, can appear grey, brown, yellow, or black. Bacteria, specifically Serratia marcescens, can cause pink or orange marks that may turn grey or black. Mold…