I recently posted a very poor review about this product that was incorrect. This product does in fact work when used correctly. My deck was in very bad condition due to neglect as can be observed in the photos. After speaking with Greg the owner of the company I was instructed on the proper way to clean and care for my deck. As a result of the Memorial Day Holiday customer support was not able to contact me immediately regarding my request for a refund and I posted the review in haste. The owner did contact me, apologized, and took the time to explain in detail how to use the product. In addition he immediately issued a refund and shipped additional product for free. "THUMPS UP"