I have a deck to clean and the people who own the deck built it own their own, but they did not finish it. About a year or so later they had vinyl put on their house and paid the guy to finish it. I guess the point I'm trying to make is half the deck is very weathered and the other half is new, is their any thing special I should use to clean it. Should I use the same pressure on the old wood as I do the new. Thanks in advance for the help....Also GREAT board!!!!!!!!