Cabot Problem-Solver Wood Brightener is a concentrate specifically formulated to remove unsightly discoloration of wood caused by tanninbleed in extractive-prone wood species suchas cedar and redwood. It also removes nailand metal rust stains. Brightens and conditions exterior siding, fences and decks Removes extractive tannin bleed and rust stains Available in two convenient formulas-ready-to-use or a value concentrate UPC: 080351180033Model Number: 140.0008003.007