To remove hard water stains, mold, mildew, soot, bird droppings, soda, wine, leaf stains, etc.: always test InstaGone in a small inconspicuous area to ensure color fastness. If there is no change in color, apply product by spraying, brushing or rolling. For best results use in direct sunlight. After waiting 10-15 minutes, wipe treated area with damp sponge or cloth.