Outdoor recreation has big rewards -- and sometimes big cleaning problems. For some people boating beats other outdoor activities for scenery, action and fun. Keeping a boat in top shape is a big job: boats get dirty even sitting at a dock. But cleaning a boat is a task that enthusiasts take in stride.Keeping a boat clean protects it from the harsh elements of sun and water and adds years to its life. Ellen Cochrane Veum and her sons, Scott and Zachary, clean her restored 1994 speed boat after every trip on the water (figure A). Cleaning the boat has become a family affair -- and a safe one too, thanks to natural household cleaners.