Iron OUT Outdoor is a pre-mixed and ready-to-use liquid formula that quickly removes rust stains from concrete, vinyl and other surfaces outside the home, without scrubbing. The professional-grade rust stain remover is effective on tough rust stains, yet safe on plants if used on surfaces near vegetation. This outdoor formula easily applies with a tank sprayer, cloth or roller and is ideal for removing rust stains from vinyl siding or exterior walls, concrete sidewalks, driveways, fences, outdoor equipment and many other outdoor surfaces.