Wood in general traps dirt, pollen and grime. Thus, when using exotic hardwood lumber you must take the time to maintain it. The main function of our hardwood cleanser is to eliminate mildew, dirt, mold and stubborn stains. It also removes graying to recondition Ipe, Tigerwood, Cumaru, Redwood, Cedar decking and outdoor wooden furniture or hardwood siding. Rejuvenate the rich color and distinct wood grain patterns each year by properly preparing the wood before refinishing. Remove the grey from exotic hardwoods and restore the all-natural lavish color. Each container is capable of cleaning up to 600 sq. ft. of hardwood surface and makes up to 5 gal. of cleaning solution. For tougher, dirtier jobs, it may require several cleanings or a more powerful blend. The concentrated powders are developed to clean external hardwood decks, fences, hardwood siding, wood railings, benches, chairs and other outside wooden objects. Do not to use a power washer on hardwood lumber, it could leave scars and often raise the wood grain. Always scrub with a non-metal brush. Wood cleansers can easily increase the pH level of lumber. Always follow cleaning with the DeckWise Deck and Wood Brightener Part 2 to restore the pH level back a neutral state. The Cleaner Part 1 is an oxygen rich wood cleaner that contains no bleach. When you observe the instructions on the Deck and Wood Cleaner label, the product is truly safe to use. It will not damage your wood, vegetation or lawn and is bio-degradable.