http://en.wikipedia.org/wiki/WD-40
"WD-40 is the trademark name of a penetrating oil and water-displacing spray. It was developed in 1953 by Norm Larsen, founder of the Rocket Chemical Company, in San Diego, California. WD-40, abbreviated from the phrase "Water Displacement, 40th formula,"[1] was originally designed to repel water and prevent corrosion,[2] and later was found to have numerous household uses."