Formulated to remove unsightly discoloration of wood cause by tannin bleed extractive-prone wood species such as cedar and redwood. Remove nail and metal rust stains. For use on new or previously stained, painted or unfinished wood surfaces including decks, siding fences, railings and steps. On weather wood brightener renews the rich "new wood" look. One gallon of diluted brighter will clean 200-250 sq. ft.