After attempting unsuccessfully to clean my three year old grey composite decking with the products I use to clean my vinyl siding I turned to the internet and discovered Corte' Clean. Initially I purchased two bags and began the cleaning process. The results varied but when I called customer service to express my concerns they once again reviewed the cleaning process and ensured me that if I followed the process. The customer service person also asked about my location and went on to share that high humidity in my area was the cause of staining problems. They also suggested a cleaning schedule that would not only reduce the cost of the produce per application but would also reduce the effort needed. What I liked most about my interaction with customer service was that someone helped me who knew the product being sold. I use a squeeze to remove water from the service of boards to enhance drying between applications of the cleaner.