i agree
my first year i was unsure where the smell was coming from. i too found it very easy to splash some bleach, and some lemon scented mr clean into the bilge, and sail around with it through a few tacks. it worked great, and also removed those tough stains that looked uncleanable down there. over the years it became clean enough for gold fish. but that was not the problem? the odor comes from the surplus gases in the holding tank. they usually leak out during rough passages that pump up the presure in there. you dont have to be a scientist to know whats decaying on all 6 sides of the tank, and its not going to get pumped out, no matter how many times you try. an old timer told me the trick is to fill it up with salt water, and a good septic cleaner, and let the boats natural motion break down the sludge, and kill all the bacteria. i use the same blend that works for the bilge. a week usually works fine. it than has to be pumped out, and reflushed a coule of times. than all you have to do is stay ahead of the game. that does the trick for me... if you have allot of company on the boat every weekend, its probably easier to leave all the windows open, and stay in calm water!