The reaction rarely turns up where you would expect it. Not on your hands during the wash, but two days later on the back of your knees, or in a stripe along your waistband, or on a child's neck where the label sits. By then wash day is forgotten and the detergent is the last thing you suspect.
When you do get round to suspecting it, you meet a wall of the word "sensitive". Every brand has one, and a good many are the standard formula with a pale blue label. The useful question is not which box says sensitive. It is what is still on the fabric once the machine has finished, because that residue is the only part of any detergent your skin ever touches.
Your skin never meets the detergent. It meets what stayed behind
The ingredients that do the cleaning are designed to leave. Surfactants lift oil and soil into the water and go down the drain with it. Almost everything engineered to remain on the fibre after the final rinse is there for reasons unrelated to getting clothes clean.
Perfume is the clearest case: its whole job is to survive the rinse and still be detectable when you open the door. Optical brighteners deposit on the fabric and stay there, converting UV light so whites read brighter. Dyes colour the product, not the wash. Fabric conditioner leaves a film by design, which is what makes towels feel soft and, as Eczema UK notes, why it is worth asking if the softness is worth it.
Most people wear this residue daily and never notice. If your skin reacts, that is where to look, and a claim on the front of a box tells you nothing about it.
Fragrance is not a rounding error
Fragrance allergy affects roughly 1% of adults and is second only to nickel as a cause of allergic contact dermatitis. Around one in ten people who go through patch testing turn out to have one, and DermNet lists laundry detergent and fabric softener among the everyday sources. And "unscented" is not fragrance-free, since a masking fragrance can be added to cover a base smell.
Non-bio is worth having, but not for the reason most people give
The received wisdom is that enzymes in biological detergent irritate skin. The evidence is thin. Eczema UK says plainly there is no scientific evidence that enzymes make eczema worse, while acknowledging that plenty of people feel their skin reacts and prefer non-bio anyway.
So treat non-bio as one line on a specification rather than the answer. What matters more is the company the enzymes keep. A non-bio product still carrying perfume, dye, brighteners and a recommendation to add conditioner has dropped the ingredient with the weakest case against it and kept the strongest. More in what non-bio actually means.
The variable nobody controls is the dose
More detergent than the water can rinse away is more detergent left on the fabric. That is the whole mechanism, and the easiest thing here to get wrong, because the dosing lines on a liquid cap sit about a third of the way up and almost nobody pours to them.
Pods do solve that, and it is the one place they hold a real edge: a pod cannot be over-poured. It also cannot be under-poured, so a half load or a sink of delicates gets a full dose whether it needs one or not. A sheet is perforated and tears, so a light load gets half and a hand wash a quarter. The arithmetic is in how much detergent to actually use.
What is in ours, including the parts that do not flatter us
By weight, from the supplier's safety data sheet: sodium dodecyl sulfate 58%, fatty alcohol polyglycol ether 17%, polyvinyl alcohol 15%, water 9%, parfum 1%. No enzymes, bleaches, phosphates, optical brighteners or dyes. Three things you should hear from us rather than find out later.
Sodium dodecyl sulfate is SLS, a recognised irritant at concentration, and 58% of a dry sheet is a concentration. What changes that is dilution: one sheet disperses across a full drum of water and rinses out. If you have been avoiding SLS deliberately, know that it is the main cleaning ingredient here.
Our sheets contain 1% parfum and we do not currently make a fragrance-free version. If you have a patch-test-confirmed fragrance allergy, that 1% is a real reason to look elsewhere, and we would rather say so than sell you a box you will react to. For skin that is generally sensitive rather than fragrance-allergic, 1% with no dyes and no brighteners is a much shorter list of things to react to than most of the shelf.
And 15% of the sheet is polyvinyl alcohol. Our biodegradation testing covered the surfactants, not the PVA, and we will not claim otherwise. Detail in our explainer on PVA in laundry.
Two loading errors that read exactly like a skin reaction
If you have tried sheets and ended up with white marks and an itch, the odds are strong the formula was not the problem. The first error is the drawer. A sheet needs direct water contact and the tumbling of the drum to disperse. In the drawer it gets neither, so it arrives late, half dissolved, and lands as a concentrated patch. The sheet goes into the empty drum first, clothes on top. Never the drawer, never dropped onto a full load.
The second is overloading. Eczema UK makes the same point generally: an overloaded drum stops clothes being washed and rinsed properly. Detergent that cannot rinse out stays on the fabric, and that is true of every format ever made.
Testing a detergent on your own skin
Change one thing at a time and give it long enough to show. Wash a few items first rather than the whole house, which is Eczema UK's own advice for trying a new powder. Run an extra rinse for the first few loads, or the baby cycle if your machine has one. Drop fabric conditioner for a fortnight before you blame the detergent, and wait two weeks before judging, since delayed reactions are the norm. For a newborn: washing baby clothes.
If you want to try ours
Non-bio, no enzymes, no bleaches, no phosphates, no brighteners, no dyes, 1% fragrance, vegan and cruelty-free. One sheet per full load, tearable for anything smaller. Cold up to 60C, front loaders, top loaders, HE machines and a sink. Septic safe, kraft paper packaging.
If your skin disagrees with it there is a 30-day money-back guarantee, and subscriptions cancel any time by email or live chat, no fees and no notice period. Testing a detergent on sensitive skin takes a fortnight, so the guarantee outlasts the test. Emerald laundry detergent sheets, 60 pack, next day in Ireland and two days to the UK.
Common questions
What is the best laundry detergent for sensitive skin?
The one that leaves least on the fabric: non-bio, no optical brighteners, no dyes, minimal or no fragrance, no fabric conditioner alongside it, and a dose you can size to the load. The badge on the front is not a specification. The ingredient list is.
Are laundry detergent sheets good for sensitive skin?
A sheet tears to fit the load, so you are less likely to overdose and leave residue. Ours are non-bio with no dyes or brighteners, but they do contain 1% fragrance, so if you are fragrance-allergic they are not the right choice.
Is non-bio better for sensitive skin?
There is no good evidence that enzymes make eczema worse, though many people are convinced their skin reacts and choose non-bio for that reason. It is a reasonable default, but check the rest of the formula before assuming non-bio means gentle.