You've probably got a can of WD-40 somewhere in your house. Maybe in the garage. Maybe under the kitchen sink. It's been around since 1953, and the formula has never changed.

But here's the thing: almost nobody knows what's in it.

And WD-40 really, really wants to keep it that way.

The Formula Has Never Been Patented

This is the first wild part. Most companies protect their formulas with patents. WD-40 chose the opposite strategy.

Why? Because patents expire. After 20 years, your secret becomes public knowledge. Anyone can copy it.

Instead, WD-40 treats their formula as a trade secret. Like Coca-Cola. Like KFC. The protection never expires—as long as they keep it secret.

Only 3 People Know (Maybe)

According to company lore, only a tiny number of employees know the complete formula. The exact number is disputed—some sources say 3, others claim it's a "handful" who each know different parts.

What we do know:

• The formula is stored in a bank vault in San Diego
• It's never been digitized
• Employees who work with it sign serious NDAs
• The people who know are allegedly not allowed to travel together on planes

That last one might be urban legend. But the company doesn't deny it.

What We Think Is In It

Okay, so we don't have the exact formula. But WD-40 is required to disclose certain ingredients for safety data sheets. Here's what's publicly known:

• Mineral oil (the base lubricant)
• Aliphatic hydrocarbons (helps it penetrate)
• Some kind of fragrance (that distinctive smell)
• Propellant (in the aerosol version)

The exact proportions and any "secret sauce" ingredients? Unknown.

Attempts to Crack It

People have tried. Oh, have they tried.

In 2009, some hikers found a handwritten formula in a dumpster near a store that sold WD-40. They posted it online, and the internet went wild.

WD-40's response: "That's not our formula."

Were they lying? No idea. But the "leaked" formula produced a product that didn't quite match real WD-40 in testing. Either they were telling the truth, or the formula requires specific manufacturing techniques that can't be captured in a recipe.

Why Does Any of This Matter?

Here's why I find this fascinating: WD-40 is not complicated. It's a light lubricant that displaces water. ("WD" stands for "Water Displacement." It was their 40th attempt at a formula.)

Generic versions exist. They work fine. You can buy "penetrating oil" from any hardware store for half the price.

But WD-40 still dominates the market. The secrecy isn't just protection—it's marketing. The mystery makes us trust the original more.

It's a masterclass in brand building through story.

What WD-40 Is Actually For

While we're here, fun fact: most people misuse WD-40. It's not a great long-term lubricant. It's designed to:

• Displace moisture (protect tools from rust)
• Loosen stuck parts
• Clean grime

For ongoing lubrication, you want actual oil or silicone spray. WD-40 evaporates.

But the blue and yellow can remains in every garage anyway. Because some things just work.

Do you have any WD-40 secrets or life hacks? Share below.