The WD-40 multi-use spray contains 5.5 oz. of lubricant that can be applied to almost any item to reduce friction and protect metal from rust and other corrosion. With over 2,000 documented uses, WD-40 is also commonly used to loosen stuck metal parts, remove grease and grime, silence squeaky components, and displace water to remove moisture from electrical systems. Even after the lubricant has dried, it continues to protect surfaces from corrosion.