Hand Sanitiser at Home: The WHO-Style Formula and When Soap Wins
A hand sanitiser only works if the finished bottle is at least 60% alcohol, and most kitchen versions quietly fall below that line. The WHO-style formula gets there with three ingredients and water: strong alcohol, a little glycerine for your skin, and a splash of 3% hydrogen peroxide to keep the bottle clean. This guide gives that formula by volume for a litre and for a 100 ml pocket bottle, shows the arithmetic that sinks the aloe vera recipes, and explains why a bar of soap still beats every sanitiser in the house.
Before you start
- The line to cross: 60% alcohol or more in the finished mix. The WHO recipes land at 75% to 80%.
- Which alcohol: ethanol 96% or isopropyl alcohol 99%. Never methanol, never “spirit” of unknown type.
- For 1 litre (ethanol): 833 ml ethanol 96%, 42 ml hydrogen peroxide 3%, 15 ml glycerine, boiled cooled water to the 1,000 ml mark.
- Rest it: 72 hours in a closed bottle before use.
- Soap wins: for dirty, greasy or wet hands, after the toilet, and during loose motions in the house.
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Why 60% is the number that matters
Alcohol kills germs by wrecking the proteins and fatty coat that hold many of them together. It needs some water to do that, which is why pure 100% alcohol is actually weaker than an 80% mix. Below about 60%, though, the kill drops off sharply. A 50% sanitiser feels the same on your palm, smells the same, and dries the same, but it simply doesn’t do the job.
That’s the whole trap with home recipes. Everything you add to alcohol (water, gel, glycerine, fragrance) dilutes it. So the question is never “did I use alcohol?” but “what percentage is left in the bottle after everything else went in?”
The WHO-style formula, scaled for a home
The World Health Organization published two hospital recipes for places that couldn’t buy sanitiser, and we’ve scaled them down from 10 litres and rounded to kitchen measures. Use a measuring jug with ml markings, not cups.
| Ingredient | Ethanol version, 1 L | Isopropyl version, 1 L |
|---|---|---|
| Alcohol | 833 ml ethanol 96% | 752 ml isopropyl 99.8% |
| Hydrogen peroxide 3% | 42 ml | 42 ml |
| Glycerine (glycerol) | 15 ml (1 level tablespoon) | 15 ml |
| Boiled, cooled water | To 1,000 ml | To 1,000 ml |
| Final alcohol | About 80% | About 75% |
For a single 100 ml bottle, divide by ten: about 83 ml ethanol 96% (or 75 ml isopropyl), 4 ml hydrogen peroxide, 1.5 ml glycerine (a little under a third of a teaspoon) and water to 100 ml. Bigger batches measure more accurately.
Making it, step by step
- Work by an open window, away from the stove, any diya, incense or cigarette. Alcohol fumes catch fire.
- Pour the alcohol into a clean 1 litre glass or plastic bottle with a tight cap, measuring it exactly: 833 ml for ethanol 96%, 752 ml for isopropyl.
- Add 42 ml of 3% hydrogen peroxide. This isn’t for your hands. It kills any spores that sneak into the bottle from the jug or the water.
- Add 15 ml of glycerine. It’s thick, so rinse the spoon into the bottle with a little of your measured water to get all of it in.
- Top up with boiled, cooled water to exactly the 1,000 ml mark. Mark the line on the bottle before you start if it has no scale.
- Cap it and shake gently. Label it “Hand sanitiser, flammable, not for drinking”, with the date.
- Leave it closed for 72 hours before use, then pour into small flip-top bottles.
The result is a thin liquid, not a gel. That’s normal. Hospitals in poorer countries use exactly this in spray or pump bottles. Use about 3 ml per rub, enough to keep both hands wet for 20 to 30 seconds while you cover palms, backs, between the fingers, thumbs and fingertips.
Why most homemade sanitisers fail
The popular internet recipe is two parts alcohol to one part aloe vera gel. Run the numbers. With isopropyl 99%, two-thirds of 99% is 66%, just above the line if you measure precisely and the gel has no water hiding in it (it usually does). With the 70% rubbing alcohol most pharmacies sell, two-thirds of 70% is about 47%. That bottle is a moisturiser that smells like a hospital.
Three other common failures:
- Vodka or local spirits. Most are 37% to 42% alcohol. They can’t reach 60% whatever you do.
- Adding essential oils “for germs”. Tea tree or neem oil in drops does nothing useful at that strength and can irritate skin. If you add scent, keep it to a drop or two and remember it dilutes the alcohol a tiny bit.
- Guessing the alcohol strength. “Spirit” from a hardware shop may be methylated, may be under strength, and in some markets has been methanol. If the bottle doesn’t state ethanol or isopropyl and a percentage, don’t use it.
Methanol (wood alcohol) must never go on hands. It is absorbed through the skin and fumes, and has blinded and killed people who used fake sanitiser. Keep every sanitiser bottle high and locked away from children: a few mouthfuls of an 80% mix can make a small child dangerously drowsy with a very low blood sugar. If a child swallows any, don’t wait for symptoms. Go to hospital with the bottle, or call 1122 (Pakistan) or 112 / 108 (India) if they’re drowsy, vomiting or breathing oddly. Rub your hands until fully dry before touching a gas stove, a match, a diya or a candle. Wet sanitiser on skin can catch fire with an almost invisible flame. In pregnancy, alcohol rubs on the skin are fine; the swallowing risk is the one that matters, for toddlers most of all.
When soap wins, every time
Soap and running water don’t have to kill anything. The soap loosens grease and dirt, and the water carries germs down the drain, which is why soap works on things alcohol barely touches. Choose soap over sanitiser in these moments:
- Hands that look dirty, oily or sticky: after cooking, gardening, car repairs, or eating with your hands. Alcohol can’t get through grime.
- After the toilet, changing a nappy, or cleaning up vomit or loose motions. The common stomach viruses shrug off alcohol; the food-poisoning 24-hour rule post covers the rest of a sick-house routine.
- Before cooking and before feeding a baby.
- Wet hands. Sanitiser on wet skin dilutes itself below 60%.
- Any time you can reach a tap. Twenty seconds, lather to the wrists, rinse, dry on a clean cloth.
Sanitiser is for the bus, the clinic waiting room, the market and the car, where there’s no sink. A stand-in. Not an upgrade.
Desi homes have always had a hand-washing ritual: the lota and chilamchi brought to guests before a meal, the ash or besan scrub after cooking fish, the rule of washing up to the wrists before touching food. None of it relied on killing germs. It relied on water, rubbing and time, which is still the method that works best.
Storing and using it
A tightly capped bottle out of sunlight keeps the WHO mix effective for months, because alcohol stays stable when it can’t evaporate. Once you decant it into a small flip-top that lives in a hot car or handbag, alcohol slowly escapes each time it’s opened. Refill small bottles every few weeks rather than topping them up forever.
Glycerine at this level stops most dryness. If your hands crack with daily use, the problem is usually frequency; a plain moisturiser at night fixes it. Cracked skin should go back to soap and a gentle cream, because alcohol stings in cracks and broken skin carries germs of its own.
If you’d like to go a step further and make soap itself, read the homemade soap and lye safety guide first; lye is far more dangerous than alcohol.
Myth: thicker gel means stronger sanitiser
Thickness comes from a gelling agent and has nothing to do with the percentage; a runny liquid at 80% beats a lovely thick gel at 55%. Read the label for “ethanol” or “isopropyl alcohol” and a number of 60% or more.
Homemade sanitiser questions
Can I make hand sanitizer with 70% rubbing alcohol?
Only if you add almost nothing to it. Seventy percent rubbing alcohol on its own is already a working sanitiser. Mix it with aloe gel or water and it quickly drops below 60%, so use it as it is, perhaps with a few drops of glycerine per 100 ml.
What is the WHO hand sanitizer formula?
For 1 litre: 833 ml of 96% ethanol, 42 ml of 3% hydrogen peroxide, 15 ml of glycerine and water to 1,000 ml, giving about 80% alcohol. The isopropyl version uses 752 ml of 99.8% isopropyl alcohol and lands at about 75%.
Does homemade sanitizer with aloe vera work?
Rarely. Two parts alcohol to one part gel only reaches 60% if the alcohol is 99% and measured exactly. With 70% rubbing alcohol, the result is under 50% and won’t reliably kill germs.
Can I use vodka or whisky as hand sanitizer?
No. Drinking spirits are usually 37% to 42% alcohol, well below the 60% needed. They’ll clean nothing that water wouldn’t.
Is sanitizer better than soap?
No, soap and water are better whenever a sink is nearby. Soap removes dirt, grease and the stomach viruses alcohol struggles with. Sanitiser is for when you can’t wash.
Why do I need hydrogen peroxide in the recipe?
It keeps the bottle free of bacterial spores that can survive alcohol and get in from jugs or water. It isn’t there for your hands. If you can’t get 3% hydrogen peroxide, make small batches and use them within a few weeks.
Is hand sanitizer safe for children?
Yes on the hands, under supervision, rubbed until fully dry. The danger is swallowing, which can make a small child seriously ill. Keep bottles out of reach and give young children soap and water wherever possible.
Can I use hand sanitizer while pregnant?
Yes. Very little alcohol passes through intact skin, and normal use is considered safe in pregnancy. Soap and water remain the first choice before cooking and after the toilet.
How long does homemade sanitizer last?
Several months in a tightly closed bottle away from heat and light. Small bottles that are opened often lose alcohol faster, so refill them from the main bottle every few weeks.
One measured bottle, one strict rule about the percentage, and a tap whenever there’s a tap. That’s hand hygiene done properly, the way the rest of the Desi Remedies formulas are meant to be: exact, honest, and no stronger than it needs to be.