Nobody measures laundry detergent. Not really. You tip liquid into the cap until it feels like enough, which is usually somewhere past the second line, and the second line was already more than the wash needed. If you use powder, the scoop disappeared years ago and you dose with whatever mug is nearest. The result in most households is the same: every load gets more detergent than it needs, and has done for years.
So the honest answer to "how much laundry detergent should I use" starts with the habit rather than the number. The habit is overdosing. It costs you money, wears your clothes, and quietly gunks up your machine — and the reason it persists is that nothing about the way detergent is sold makes the right dose easy to hit.
Why the cap keeps winning
Look inside a liquid detergent cap. The dosing lines are moulded into translucent plastic, unprinted, and sit around a third of the way up. Everything about the design invites you to fill past them. You do not need a conspiracy to explain this — pouring a viscous gel into a small cap over a drum at seven in the morning is simply not a precision activity, and the cost of pouring too much is invisible on any single wash.
The label does give you a proper system: a millilitre dose per load, adjusted upward for heavy soiling and hard water. It is a fine system in theory. In practice it asks you to know your water hardness, judge how dirty a mixed basket is, and measure millilitres of gel in an unmarked cap, several times a week, forever. Nobody sustains that.
What too much detergent actually does
Past the right dose, extra detergent does not clean anything extra. It just fails to rinse out. Some of it stays in the fabric — which is why towels go stiff and scratchy, darks turn dull, and "clean" clothes carry a faint soapy smell that gets worse in a warm room. Fabric that holds detergent residue also sits against your skin all day, which matters if anyone in the house has sensitive skin.
The rest stays in the machine. Residue builds up in the drawer, the door seal and the drum, and that build-up is one of the main reasons washing machines develop a smell. Add the extra rinse cycles people run to fix the symptoms, and overdosing manages to waste detergent, water and electricity at the same time. None of this shows up in a single wash. All of it shows up over a year.
The right dose, by format
If you use liquid or powder, the correct answer is unglamorous: read your label, find the millilitre or gram dose for your load size and water hardness, and measure it with something that actually has markings. Done consistently, that works.
The more realistic answer is to stop measuring altogether. Pods were the first format to do this, and it is worth conceding that they fixed the dosing problem properly — one pod, one load, no judgement required. But a pod fixes dosing by wrapping liquid detergent in another layer of dissolvable plastic, and it is all-or-nothing: you cannot split a pod for a small load. Pods solved dosing and kept the plastic.
Laundry sheets are the same idea taken a step further. The dose is pre-measured into a thin dry sheet: one sheet for a full load, and when the load is light, the sheet tears in half along a perforation. That is the entire dosing system. No cap, no lines, no judgement at 7am — and the dose scales down as well as up.
"A thin dry sheet can't wash a full drum"
That is the doubt, so it is worth answering directly. A detergent sheet is what is left when you take the bottle away: concentrated cleaning agent with the water removed. Ours is 58% sodium dodecyl sulfate and 17% fatty alcohol polyglycol ether by weight — the working surfactants, not filler. The sheet dissolves in the wash and works at 30–60°C, in cold water, in hand washing, and in front loaders, top loaders and HE machines alike. If you want the mechanics in detail, we have covered them in how laundry detergent sheets work.
On set-in stains, honesty is cheap because the bar is level: no detergent format shifts a set-in stain unaided — not liquid, not pods, not sheets. The fix is pre-treating, and here sheets have a genuine edge. Wet a corner of the sheet, rub it directly into the stain, then wash as normal. You cannot tear a corner off a pod.
"I tried sheets and got residue"
This is the most common reason people go back to the bottle, and it is almost always a loading error rather than a format failure. The sheet goes into the empty drum first, then the clothes go on top. It does not go in the detergent drawer — sheets have nothing to do with the drawer, as we explain in where to put laundry detergent — and it does not go on top of an already-full drum, where no water reaches it to dissolve it.
The other culprit is overloading. Cram the drum to the top and nothing rinses properly, whatever format you use. Leave a hand's width of space at the top of the load and the residue problem disappears.
What this looks like in practice
Our sheets come 60 to a pack, perforated to tear, in kraft paper. They are non-bio, with no bleaches, phosphates, optical brighteners or dyes, septic-safe, vegan and cruelty-free, and fine for whites, colours and darks in the same basket.
If they do not clean the way you are used to, send them back — every pack carries a 30-day money-back guarantee. Subscriptions can be cancelled any time by email or live chat, with no fees and no notice period. Delivery is next-day in Ireland and two days to the UK. The pack is here if you want to stop measuring.
FAQ
How much laundry detergent should I use?
For liquid or powder, the dose printed on your label for your load size and water hardness — measured, not estimated. For laundry sheets, one sheet per full load, half a sheet for a light one.
Can you use too much laundry detergent?
Yes, and most people do. Excess detergent does not rinse out fully; it leaves residue on clothes, builds up in the machine, and is a common cause of stiff towels and a smelly drum.
How much detergent do I need for a full load?
One pre-measured sheet, or your label's stated dose of liquid or powder for a full drum. Heavily soiled items need pre-treating, not extra detergent — rub a damp corner of a sheet into the stain first.
Do I use less detergent in an HE machine?
HE machines use less water, so overdosing shows up faster as residue. Sheets need no adjustment: one sheet per full load applies to front loaders, top loaders and HE machines alike.
How many laundry sheets per wash?
One for a full load. Tear along the perforation and use half for small or lightly soiled loads.