It is effective in removing oils, dirt, old grease, and other contaminants and will also aid in preventing future accumulation. It provides a thin, non-greasy coating that lubricates and prevents rust and saltwater corrosion on engine blocks, hose clamps, locks, latches, hinges, trailers and other metallurgical surfaces. Clenzoil also nourishes, preserves, and protects wood accents on boats and other marine equipment. It will not harm synthetic surfaces, leather upholstery, canvas, or rubber. Clenzoil is also great for downriggers, winches, pulleys, trailers, and anything that may corrode or oxidize due to exposure to everyday environmental and weather conditions. Not recommended for painted surfaces.