Instant Mold Stain Remover is designed to clean stains from mold and mildew within minutes of application, by instantly targeting deeply-embedded mold stains, saving the applicator time and labor. Works on wood and concrete substrates Ideally suited to mold stained attic sheathing and basement areas Targets and removes deeply embedded stains from mold and mildew* Works within minutes of application No scrubbing required For indoor and outdoor use