Our mildew gels contain emulsifiers, bacteriostatic agents and surfactants. It can remove black mold from any surface, clean long-attached black stains, and make the home environment cleaner. Its application is simple: 1. Dry the surface with a cloth. 2. Squeeze the gel evenly onto the surface. 3. Wait 3 hours and rinse with water. It only takes five minutes to apply the gel and three to eight hours to remove black mold from every corner of the house.