Cleans all wood types including redwood, cedar, mahogany and other highly resinous woods. While many cleaners can darken these woods, this deck cleaner actually helps restore their natural color and beauty. Key Features: Removes Stains from Dirt, Mildew, Algae and Fungus. Eliminates Tannin, Rust Stains and Mill Glaze on New Wood. Brightens and Restores Wood’s Natural Beauty. Ready to Use. Use Before Waterproofing: Decks, Fences, Outdoor Furniture and Other Exterior Wood Surfaces. Great for use on redwood, cedar, highly extractive wood, if you need to remove tannin staining and restore lighter color of redwood/cedar/mahogany or other highly extractive wood species in addition to removing stains from dirt, mildew, algae and fungus and/or as instructed, to neutralize any wood species after using other cleaners.