This super-concentrated formula activates with water, making it easy to tackle tough stains like mold, mildew, algae, soot, nicotine, and more. It's safe to use on tile, grout, vinyl siding, brick, wood, and stucco. Just mix with water, spray directly onto the stain, and see the dirt and grime vanish—no vigorous scrubbing needed! It comes with a handy spray bottle and two 24 oz. cleaner packs for your convenience.