I live right next to our town beach, and it's always surprizing to me how long it takes for soap or shampoo to dilute with the water. It's not that often someone baths like that, but when they do they usually leave a scum that lasts a couple days sometimes. I don't see the problem with rinsing inland any soaps whether body or dishes. It takes over a year for bio soaps to break down, I wonder how long it takes for other soaps. The BW is used a lot, and if everyone bathed in the lakes and put thier dish soap in the lakes I think it would have an impact.