I don't know if anyone else has this problem, but I get this terrible black streaks down the side of the boat on the outside at the gaps in the teak toe rails & where the stantions are, which appear to come from rain run off. has anyone else had this problem too? They are a real pain to get rid of. The deck is kept very clean, so I think perhaps the streaks come from dirt under the teak or perhaps in the stantions?? any thoughts?? washing the sides of the boat every time it rains to get the streaks off seems a bit ridiculous, isn't rain supposed to clean the boat?