I really haven't messed with stuff like that, before, so this is just a 'wondering outloud' type question. The cleaner may be enviro friendly, but what about the oil/sludge that is also being sent overboard? Wouldn't it still be oil and sludge, just dispersed some for ease of cleaning?Starbrite makes an environmentally friendly bilge cleaner. Pour in your bilge, fill with water and let it soak several hours or longer. They even suggest to run boat so it swishes around. I just use a long brush for scrubbing bottom. Turn on bilge pumps to drain most waste, shop vac to get rest. Here's my bilge.