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.

WD-40 Company Celebrates 65th Anniversary - Engine Builder Magazine

WD-40 Marks 65th Anniversary by Securing Iconic Product's 'Secret Formula' - Times of San Diego

WD-40 Company Celebrates 65th Anniversary - Engine Builder Magazine

Pravin Joseph on LinkedIn: If you don't know

Armed guards for WD-40 formula's bank change

WD-40 Company Enlists Armored Security to Move Top-Secret Formula to New Location, Celebrates 65th Anniversary

WD-40 History, Learn the Stories Behind the WD-40 Brand

WD-40 To Mark 60 Years Of American Heritage With New, Special Packaging - aftermarketNews

Does WD-40 remove calcium deposits on faucets? - Quora