Jim, I have noticed that wood maintenance is non existent here in south florida. So when we are asked to "clean" wood fences and decks, that are 5 years old and have never been properly maintained, we have to use bleach with hydroxide. i usually run 10-20% sh with a small amount of hydroxide beads, nothing super strong like degreaser strength-just to add a little heat and bite, then i give it a good rinsing with a 6530 tip after about 5 minutes or so of dwell. I also neutralize with oxalic acid after rinsing only about 1/2 to 3/4 cup per gallong. BUT....the market down here is weird, they look at you sideways when you educate them on proper wood care and maintenance frequency. Most say for the money they will spend on maintaining their pt fence or deck, they would rather have it balsted and furred and wait for a "storm" insurance claim to remove and replace it. Very little pride for wood around here, but I guess we dont see as much of it as in the other areas of the country. We do have a ton of aluminum, vinyl, and trex for decks and fences. Thats just what I have noticed in my limited time, Jim have you got alot of requests for wood cleaning, proper wood cleaning and maintenance, or is it just the old blast and fur requests??