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What does WD40 mean?

wd40.jpgQuestion

I had problems with the lock on my front door and someone told me to go and buy some WD40. So what does WD40 mean?
Mark, Sunbury

Answer

** Definitive **
Name: Steve, Kent
Qualification: My friend’s Dad works for an oil company
Answer: It came from when a company was trying to create a Water Displacement liquid and when they finally got it right, it was their 40th attempt – hence WD40.

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