RMR-86 is the revolutionary new mold stain remover that is cutting labor time and costs in half for contractors across the country. Your work is now done in seconds! Simply spray it on any hard surfaces and watch the mold stains disappear within 15 seconds. Simple and Quick! It's our powerful bleach-based patent pending formula. No more time consuming sanding and scrub brushing. We recommend using RMR-141 RTU Mold Killer to treat all surfaces after RMR-86 has been applied. RMR-86 Mold Stain Remover has superior penetration into porous surfaces such as Wood, Concrete, Drywall, Tile & Grout, Fiberglass, Vinyl and More. Works great all around your Home!