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WD-40 is the trademark name of a widely-available water-displacing spray developed in 1953 by Norm Larsen, founder of the Rocket Chemical Company, San Diego, California. It was originally designed to repel water and prevent corrosion, and later was found to have numerous household uses.

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13y ago
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14y ago

It means Water Displacement 40th attempt.

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15y ago

The W stands for Water. WD= Water Displacement

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15y ago

Water Displacer no 40

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15y ago

Water Displacement

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14y ago

"Water Displacing"

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Q: What does WD-40 mean?
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