Why Millions Of People Over 70 Have Laundry That's Turning Musty...

My mother spent months trying to fix her musty laundry before she finally called me. What I found when I started looking into it is something almost no one in America has heard of.

Most people who experience this spend years assuming it's their machine, their detergent, or maybe even the water in their area. None of those are the cause. The real cause is something else entirely — and once you understand what it is, the reason every fix you've tried hasn't worked will make sense.

The Phone Call From My Mother That Started All Of This

My name is Dr. James Mitchell. I've spent 31 years working as a research chemist. I'm not going to pretend I had any reason to look into this on my own — I didn't. I looked into it because of a call from my mother.

My mother is 74. Months before she called me, her laundry had started smelling musty — a faint smell that wouldn't come out no matter what she did.

She had tried four different detergents. She had added a second rinse cycle to every wash. She had cleaned the inside of her washing machine twice with vinegar. Nothing made a difference.

She called me because she'd run out of ideas.

I told her I'd look into it.

I didn't know the answer either.

What I Found When I Started Looking

I spent about three weeks reading through a ton of research papers until I found one on body chemistry that explained everything.

What I found was a study published by a team of Japanese researchers in 2001 — work that identified a specific compound the human body begins producing after a certain age. They named it 2-nonenal.

Here is what 2-nonenal is, in plain language.

After a certain age — typically around 40, and increasing each decade — your body begins producing a particular oil. The oil sits on the surface of your skin and chemically bonds to it. It is not sweat. And it cannot be lifted by regular soap.

From your skin, the oil transfers onto everything your skin touches. Your shirts. Your sheets. Your towels. The collars and underarms of clothing you wear most often. The pillow you sleep on every night.

Once the oil is in fabric, no laundry detergent on the market is built to remove it. Detergent is designed to lift dirt and water-soluble grime out of clothes. This compound is neither.

And as the oil sits in the fabric, it gives off a faint, musty scent — the exact smell my mother had been trying to wash out for months.

That single fact explains everything my mother had tried. The detergents didn't work because no detergent is built to remove this. The vinegar didn't work because it's a different kind of cleaner for a different kind of problem. Every approach she had taken was aimed at the wrong target.

The reason most people don't realize this is that nobody talks about it. Walk into any American grocery store and the entire laundry aisle is built on the assumption that any smell in your clothes can be removed with the right detergent. For this particular compound, none of it works.

The answer isn't in the laundry aisle. It never has been.

The Ingredient The Japanese Have Been Using For Decades

The reason I kept finding research on this compound coming out of Japan — and almost nowhere else — is that the Japanese figured out the solution to it decades ago.

They have a name for the compound in everyday language: kareishu, which translates roughly to "aging body odor." It is not a taboo topic in Japan the way it is in America. Older men and women talk about it openly. And the solution sits on the shelf of nearly every Japanese drugstore.

The ingredient is persimmon.

Specifically, the tannins inside the Japanese persimmon fruit.

In 2012, a research group affiliated with Suntory tested a soap formulated with a polyphenol complex of persimmon and tea extracts on a group of middle-aged and older men. Over four weeks of daily use, the compound levels measured on their skin dropped significantly.

The mechanism is straightforward. Persimmon tannins chemically bind to the oil on the skin and break it down — neutralizing the compound before it can transfer to clothing.

This is the part of the puzzle that completely changed how I thought about my mother's problem.

You cannot wash the compound out of fabric. The chemistry does not allow it.

But you can stop it from transferring to fabric in the first place. And once it stops transferring, the existing compound in your clothes fades with normal washing over a few weeks — because nothing new is being deposited to replace it.

The American Brand Finally Doing This Right

When I went looking for a persimmon soap I could send to my mother, I ran into a problem.

Most "persimmon soaps" sold on Amazon are not actual persimmon soap. They contain trace amounts of persimmon extract — sometimes a fraction of one percent — and trade on the name.

After about two weeks of looking, I found one American brand that uses a high enough concentration of Japanese persimmon tannins to do what the Suntory research describes. It's called Swarva.

The bar is bright orange — which is the natural color of persimmon extract itself, not a dye. It smells like fresh citrus. It lathers like an ordinary luxury soap. From the user's standpoint, nothing about it feels unusual.

But the chemistry is fundamentally different from any other soap on the American market. The persimmon tannins stay on the skin's surface long enough to bind to the oil the body is producing — and neutralize it before it can transfer.

I bought a three-bar bundle and shipped it to my mother.

What Happened With My Mother

She started using it the day it arrived. I told her not to expect anything for the first week or two — the existing compound in her clothes still had to wash out, and that takes a few normal wash cycles before the level comes down.

After about three weeks, she called me back.

The shirts in her closet had stopped smelling musty. The bedsheets were coming clean again on a normal warm cycle. The towels in her bathroom — which she'd been rewashing every other week trying to fix — finally smelled like towels.

She had stopped buying new detergent.

She had stopped running second rinse cycles.

She had stopped suspecting her brand new washing machine.

The problem had never been any of those things. The problem was the compound transferring onto her clothes every single day, faster than any detergent could ever remove it. Once that stopped, her laundry routine could go back to what it had been ten years earlier.

She's ordered Swarva twice since. She's also sent a bar to one of my aunts.

Stop Buying More Detergent

If your laundry has been smelling musty for months — or years — there is almost no chance the cause is something you've been thinking about.

It's not the detergent you're using. It's not the next detergent you're about to try. It's not the scent booster, the brightener, the fabric softener, or anything else on that aisle.

The compound causing the smell is being deposited onto your clothes from your skin every single day. And until you address it at the source — on the skin — no detergent on the American market is going to make a meaningful difference. You'll keep washing. The smell will keep coming back. The detergent you buy next week will do exactly what the last four did.

The good news is that once the source is addressed, normal washing brings the existing levels in your clothes down on its own within a few weeks. No new washing machine. No new detergent. No more vinegar cycles.

My mother spent months buying different detergents trying to fix this. None of them worked. The actual fix cost her less than the second-cheapest detergent on her shelf — and replaced what she'd been doing in the shower already.

The chemistry is settled. The Japanese have been using this for decades. The only question left is whether you'll spend another year buying detergent for a problem detergent was never going to solve.