STP Pro-Series 3-in-1 Rust Penetrant & Lubricant + Anti Rust Spray Protection offers a multi-purpose solution for home and auto. Engineered with anti-rust technology, this rust remover penetrates stubborn rust to fight corrosion and displace moisture. Use it as a door hinge lubricant to quiet squeaks, or as a spray lubricant to help avoid stripping threads. As a cutting oil, it reduces heat and friction with hand tools. The permanent straw allows for precision applications with a wide spray or precise stream. Spray onto affected areas in any direction to treat and help protect against rust.