WD-40 secret formula lives in a San Diego bank vault

It's one of the most recognizable names on any garage shelf, under kitchen sinks and tucked into most tool belts. And for years, its hand-written secret formula has lived in a San Diego bank, a place where many know its location but few can visit.
It’s one of the most recognizable names on any garage shelf, under kitchen sinks and tucked into most tool belts. And for years, its hand-written secret formula has lived in a San Diego bank, a place where many know its location but few can visit.

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How WD-40 is Protecting Their Secret Formula

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How WD-40 is Protecting Their Secret Formula

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