On our 1999 340, the rub rail material on the leading and trailing edge of the radar arch has a fair amount of spotting on it. This is odd because no lines or other materials come in contact with these surfaces. This appears to be caused by atmospheric conditions, but I am not certain- either way it is very difficult to get off! The rubber is the same material as the rub rails above the gunnels (which are also hard to keep clean). Does anyone have any suggestions on cleaning these surfaces???
