Most power boats and sail boats are made of fiberglass, finished with a gel-layer coating that can be easily stained and damaged with traditional cleaning chemicals. In addition to the oxidizing of the gel-coat, wooden & metal surfaces require regular cleaning- the battle to keep rust & rot at bay is constant. Winter damage and water intrusions creates cracks or mold in hard to reach areas, but vapor-steam, with its low pressure and safe temperature, is the best tool for boat cleaning and prepping jobs. The light pressure penetrates and safely blasts away debris from surfaces. Tests reveal disinfection after treating surfaces with vapor-steam; thus, cleaning with the Optima Steamer offers many advantages over alternative methods.