Cadie Tile Grout Stain Erasers (Set of 2) Chemical free cleaning blocks quickly remove stains and dirt with a simple rub over grout lines. Also excellent for removing water stains, calcium deposits, wax buildup and mildew. Ideal for bathrooms, kitchens, floors and swimming pools. Will remove water stains, mildew, calcium and wax build up as well as coffee and organic stains and algae. each eraser block measures 4.5 x 2 x 0.5 Includes: 2 x Cadie Tile Grout Stain Erasers