Superdeck® Wood Cleaner is designed to restore natural beauty to exterior wood such as decks, siding and outdoor furniture. Wood surfaces are constantly bombarded by pollutants that result in an old weathered appearance. Wood Cleaner is a biodegradable and won't harm plants and other vegetation. The concentrated liquid formula will make up to 4 gallons of cleaning solution that will clean stains caused by dirt, mold or mildew. Used in its concentrated form, it can also remove failed, oxidized transparent and semi-transparent finishes. By cleaning wood and removing surface contaminants, it allows for better penetration of a subsequent wood coating. Wood Cleaner is non-flammable, fast-acting, and easy to use. Note: When cleaning redwood or cedar, wood extractive s (tannins) may be brought to the surface. These may be neutralized with Superdeck Wood Brightener after cleaning.