WD-40 protects metal from rust and corrosion, penetrates stuck or jammed parts, displaces moisture and lubricates just about anything. WD-40 is also great when it comes to cleaning grease, grime and other marks from most surfaces. WD-40 Smart Straw has a fixed delivery system which means you?ll never lose the straw again! For a more precise, narrow spray simply lift the straw 90 degrees. This allows you to get into those hard to reach areas. If you need a wider spray, push the straw pack down against the can and spray as normal.