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WD-40 420ml is a multi-purpose spray that can be used for a variety of tasks, including: Lubrication: WD-40 can lubricate moving parts like door hinges, latches, and window channels. It can also be used to relieve squeaking in automotive doors, windshield wipers, and more. Rust removal: WD-40 can remove rust from metal surfaces and prevent corrosion. Cleaning: WD-40 can remove grease, grime, stains, dirt, and dust from a variety of surfaces. It can also be used to clean piano keys and shower screens. Moisture displacement: WD-40 can displace water and create a protective barrier on surfaces. It can also be used to dry out electrical systems to prevent moisture-induced short circuits. Coating: WD-40 can be used to coat surfaces to prevent damage from moisture. WD-40 can be used on a variety of surfaces, including metal, wood, chrome, aluminum, glass, and plastic. It comes in a Smart Straw Aerosol, which has a permanently attached spray mechanism that can be flipped up for precision spray or flipped down for spraying wide areas.