Superdeck Wood Cleaner is a biodegradable cleaner that is safe and effective for cleaning exterior wood surfaces such as decks, fences, outdoor furniture, siding, log homes, and hardwoods. The concentrated liquid formula will make up to 4 Gal 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, biodegradable and easy to use.