I need to go over my "new" boat with an overall wash to clean her hull and deck after she has sat in the yard for a couple of years. I need to remove normal dirt and grime plus the green slimey stuff. I was just going to start with Dawn in a strong solution. Simple Green is a good one, but what about just plain ammonia in water? Any thing else I should consider for this kind of cleaning? I plan to do some cosmetic work on the hull and then polish and wax before I put her in the water for the first time.