Steve, I hear ya man. Its really all about phosphorus and people easily blur the lines of science when trying to do good. Poultry manure is high in P and many producers have serious nutrient management plans and can only spread so much on their land. Hog producers are highly regulated and pumping their lagoons becomes a complex algorithm of acre feet of water storage and weather forecasts. Poorly timed applications of any nutrient end up in the water and industry, agriculture, sewerage/sseptic and pet waste is way more of a concern than a pleasure yacht getting bathed from time-to-time.
I did not read all the posts, but wonder if in fact people are actually having suits filed or fines levied. We figure in our business as it goes in CA or WA, so it goes eventually in NC.
The vinegar and baking soda works fine for cleaning the decks, I tried it last summer after sailing up to the Chesapeake. I read an article in their local sailing rag about it and the chandlery there at that marina on the Elizabeth had both baking soda and vinegar for cheap. I tried it a few different ways. It took most of the black stuff, the fish guts from our northward protein harvest plus the soap residue, salt water and all the rest of the collected grunge from cruising. We're not talking diesel soot here thougfh.
I think I'll use less soap as a result, regardless of the relatively negligible point-source pollution. Managing lots of livestock along a waterway, I'm used to thinking about my nutrient impacts, so if I have a good alternative I'll use it. I'll also use soap to wash dishes and for the boat when necessary and I'm all about the acids used sparingly. They are all neutralized with water and used in small amounts. I think moderation is the key and I'm not going to suds my boat up every month but I could care less whether you do. There are bigger fish to fry in the arena of water quality but that's no excuse for any of us to blow our own BCNB's, or Boat Care Nutrient Budgets.