A Familiar Spray, a Curious Question

I was in the garage, loosening a stuck rusty garden hose nozzle, when I grabbed that familiar blue-and-yellow can of WD-40. As I sprayed, it hit me: I’ve been using this stuff for decades, but I had no idea what “WD-40” actually stood for.

We all say it without thinking—“Grab the WD-40”—like “Pass the salt” or “Turn it off and on again.” It’s part of the fixer-upper language. But the name? Completely mysterious. That curiosity led me down the rabbit hole.

The Cold War Origins

Here’s the cool part: WD-40 traces back to 1953. Chemist Norm Larsen worked at the Rocket Chemical Company. Their mission? Create a formula to prevent missile parts from corroding. Not for squeaky doors or stuck bike pedals—real Cold War missiles.

Larsen and his team experimented with water displacement formulas. They failed 39 times before perfecting the 40th attempt. And that’s the name: WD = Water Displacement, 40 = 40th formula. No marketing gimmicks. Just plain, geeky truth.

Most People Don’t Know This

Despite decades of household use, few know WD-40’s origin. In 2015, journalist David Muir asked Twitter users what it meant. Answers ranged from “Window Duster” to “Weird Duck.” Many had no clue at all, while others confidently guessed correctly—sometimes after a quick Google search.

From Missiles to Household Miracle

Once the 40th formula worked, the Rocket Chemical Company began selling it widely. Soon, people discovered it wasn’t just for missiles. Rusty tools, stuck zippers, squeaky hinges—you name it, WD-40 fixes it.

I’ve used it to unscrew old grill bolts, clean gunk off scissors, and yes, even remove gum from carpet. My husband uses it for nearly everything. The company eventually dropped “Rocket” from its name, becoming the WD-40 Company. One product, one formula, global phenomenon.

Persistence Pays Off

What resonates most is the 40 attempts. Most people would’ve quit long before the 40th try. It’s a story of persistence, trial, and a bit of luck.

Every time I spray WD-40 on bike gears or a stubborn hinge, I think about those 39 failures. It’s a reminder not to give up—and the next time someone asks, you can casually say: “Water Displacement, 40th formula.”