My boat really got dirty this winter, outdoor storage with a custom cover that must have flapped against the boat. Boat was covered with the usual coal dust from calumet harbor area and brown stains from the cover. I used a boat soap to wash the deck and roll off to get the stains off the deck. It still needs more cleaning and I am hoping for some suggestions for a better product to get the stained and more heavily soiled areas of the deck(nonskid) clean. I used a deck brush and some small hand brushes. Any ideas appreciated. Thanks