Liquid Sandblast Landscape Cleaner effectively removes and controls algae, lichen, mildew, and mold. It can be used for horizontal and vertical applications. Liquid Sandblast Landscape Cleaner is great for use on pool tile, coping, brick, stucco, block wall, wood fences, concrete, water features, monuments, natural stone, pavers, and bare or sealed surfaces, including boats and roofs.