For three years, I thought I had a skincare problem. It turned out I had a laundry problem.
My name is Nadia Kowalski. I am a dental nurse from Leicester, and for most of my late twenties I dealt with skin that was persistently itchy, reactive, and prone to flaring up in patches, particularly on my arms, the back of my knees, and anywhere clothing sat close to my skin for long periods. I had been to the GP. I had seen a dermatologist. I had tried different moisturisers, different shower gels, cut out various foods at various points. Some things helped a little. Nothing fixed it.
It was my colleague Britt, who has a daughter with eczema and has therefore become an involuntary expert in skin irritants, who finally asked the question nobody else had: what detergent do you use?
The Question That Changed Everything
I was using a standard bio detergent. Had been for years. It was cheap, it cleaned well, and I had never thought twice about it. Britt explained, patiently, that biological detergents contain enzymes that are highly effective at breaking down stains but can also break down skin proteins, and that for people with sensitive or reactive skin, the residue left in fabric after washing can be a significant and persistent irritant.

I went home and looked it up. The more I read, the more it made sense. I had been treating the symptom, my skin, while the cause was sitting in my washing machine drawer.
I switched detergents that week. I chose the Persil Non Bio 3 in 1 Laundry Capsules for a few specific reasons: dermatologically tested, recognised by the British Skin Foundation, designed to dissolve fully even in cold and quick washes, and 108 washes per pack. The plastic-free, recyclable packaging was a bonus I had not expected at this price point.
The First Two Weeks
I washed everything. Every item of clothing, every bedsheet, every towel. The capsules dissolved completely in a 30-degree quick wash. No residue on the drum, no undissolved gel on the clothes.

By the end of the first week, the itching on my arms had reduced noticeably. By the end of the second week, the patches behind my knees, which had been a near-constant presence for two years, had cleared almost entirely.
I sat with that for a moment. Three years of appointments, products, and dietary experiments. Two weeks of different washing capsules.
I called Britt and told her. She was not surprised.
Six Months On
I have not gone back to bio detergent. I will not. The difference in my skin has been sustained and significant. The reactive patches are gone, the background itchiness that I had come to think of as just how my skin was has not returned.

The cleaning performance has been genuinely good. I work in a dental practice, which means my uniforms need to come out properly clean, and they do. Whites have stayed white. The 3-in-1 formula handles cleaning, brightening and conditioning in a single capsule.

The 108-wash pack lasts our household, two adults, about two months. The plastic-free packaging means I am not adding to the pile of plastic laundry bottles that used to accumulate under the sink.
I have recommended this to four people since switching. Three of them had similar experiences to mine. Skin that had been reactive or itchy for years, calming down within weeks of the switch.
The Honest Verdict
If you have sensitive, reactive, or eczema-prone skin and you have not looked at your laundry detergent yet, look at your laundry detergent. It might be the thing you have been overlooking. It was for me.

Find the Persil Non Bio 3 in 1 Laundry Capsules – 108 Washes at ALTOE. Listed in Latest Products, Home & Garden, Household Supplies, and Laundry Supplies.
Check your detergent. It might be simpler than you think.
— Nadia Kowalski, Leicester
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