Tery, as you know, this is a current topic with the UAMCC. The more I explore training, the more I am starting to see a veritable hornet's nest. I would say the best way to do decks is to use low pressure and a two step chemical cleaning process. Then, when I think about that, Shane from Texas would be able to look me right in the eye and cry foul. He used high pressure and bleach. How can anyone argue his results? Ten plus years in the business and some of the most beautiful pictures of finished deck work this industry has seen. I am personally, and I emphasize 'personally' because at this stage of the game no decisions have been made, that training contractors in the operation of business, ethics and long term strategy is more important that advocating technique. As has been said many times, there is more than one way to skin a cat. Pushing a certain method of cleaning over another creates a controversy that may not be prudent.