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http://commons.wikimedia.org/wiki/File:Envase_WD-40.jpg

WD-40 has never been patented. The ingredients are a trade secret.

February 8, 2013May 6, 2013 | Technology

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Futility Closet is a collection of entertaining curiosities in history, literature, language, art, philosophy, and mathematics, designed to help you waste time as enjoyably as possible.

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