The Stain Library

How to remove baby sick from a blanket

  • DifficultyModerate
  • OutlookUsually removable
  • MaterialBlanket
  • Reviewed7 September 2026

The short answer

Find out what the blanket is made of first. Cotton and acrylic take a cold rinse, a biological detergent soak and a cool wash, which deals with almost any milk mark. Wool needs a neutral wool detergent instead, because biological detergent digests wool as readily as it digests the stain. Dry it spread out with air on both sides, never in a tumble dryer.

If it has just happened

Rinse the affected area from the back under a cold tap while you find the care label. Both are urgent and the label decides which detergent you can use.

Heat can set this stain permanently

Do not use hot water, a tumble dryer, an iron or a steam cleaner until the mark has gone. Heat fixes this type of stain into the fibres and makes it far harder to shift.

Test on a hidden area first

Try any cleaner on a hidden part of the material first, such as a seam, an offcut, inside a hem or under a piece of furniture. Wait for it to dry and check for colour change before treating the visible mark.

Cleaning the mark is not the same as disinfecting

If the sickness came with a stomach bug rather than an ordinary posset, the surface may carry norovirus, which spreads easily and survives on hard surfaces. UK public health guidance is to wear gloves, avoid shaking contaminated laundry, wash affected laundry separately with normal powder at 60 C where the care label allows it, and disinfect compatible hard surfaces with a bleach based product afterwards. Do that after the stain work, not instead of it, and only where the material tolerates it.

Keep every kind of drying heat away until the mark has gone

Baby sick is mostly milk protein. Heat coagulates protein and locks it into the material, which is why a mark that would have washed out can become permanent after one hot wash, one pass with an iron, a hairdryer or a spell on a radiator. Cool or warm treatment, air drying, and a proper look in daylight before anything warm goes near it.

What you will need

  • Disposable gloves Sickness that came with a stomach bug is a hygiene job as well as a stain.
  • A spoon or blunt scraper For lifting solids off before any water is involved.
  • Cold running water Cold first. Warm water starts to set milk protein into cotton.
  • Biological laundry detergent What this is Protease enzymes break the milk protein apart. This is the main tool on cotton.
  • A bowl or sink for soaking Long cool soaks do the work that a hot wash is not allowed to do.

Helpful but not essential

  • An oxygen based stain remover For whites and colourfast items, against the yellowing that milk fat leaves.

Fresh baby sick on blanket

Cold water, then enzymes, then time. Heat comes last or not at all.

  1. Lift the solids off before adding water

    A spoon, worked from the outside of the mark inwards. Wetting solids spreads them, so this step is worth the twenty seconds it takes.

  2. Rinse from the back under a cold tap

    Hold the fabric with the mark face down and run cold water through the back of it, so the milk leaves the way it came in rather than being pushed through the weave. Cold, because warm water begins to set the protein.

  3. Work biological detergent into the damp mark

    A little neat biological detergent rubbed in with your fingers, then left for fifteen minutes. The enzymes cut the milk protein into fragments small enough to rinse out.

  4. Then wash, and check before drying

    Wash cool with the detergent the fibre allows, and dry it spread out with air on both sides rather than in a dryer.

  • How longFifteen minutes, plus the wash
  • RepeatingRinse until the water runs clear before washing.
  • Stop ifthe water runs clear and nothing more lifts onto a white cloth

Dried baby sick on blanket

Soaking replaces the heat that this stain does not allow.

  1. Break the dried milk off dry

    Flex the fabric between your fingers to crack the crust and brush the pieces away. Every flake removed dry is one that does not have to be dissolved.

  2. Soak in cool water with biological detergent

    The cleaning trade body's guidance for spit-up is a soak of at least thirty minutes for a fresh mark and several hours for an older one. Lukewarm water at around 30 C dissolves milk fat better than cold and is still well below setting temperature.

  3. Work the mark between your fingers now and then

    Rubbing the fabric gently against itself lifts softened residue out of the weave without the damage a brush would do.

  4. Rinse, wash and look at it dry

    Rinse for longer than feels necessary, wash cool and dry it spread out. Thick items hold residue in the middle.

  • How longThirty minutes to several hours
  • RepeatingRepeat the soak rather than raising the temperature.
  • Stop ifthe mark has gone before the item goes near a dryer or an iron

Old or set in baby sick on blanket

Once the protein has gone, what is left is milk fat, and that needs a different tool.

  1. Overnight soak in biological detergent

    Cool water and a scoop of biological powder, left overnight. Contact time is the lever that replaces temperature, and it is more effective than people expect.

  2. Then an oxygen soak for the yellowing

    An old milk mark usually ends as a yellow patch, which is oxidised fat rather than protein, and enzymes do nothing to it. An oxygen based stain remover in cool water is the correct escalation. Check the care label and test a hidden seam on anything coloured.

  3. Wash cool and dry in the air

    Wash cool, dry spread out and give it a full day before judging the result.

  4. Then stop before you use heat

    If it has not gone, a hot wash or a dryer will fix it permanently. A faint shadow on a used item is a better outcome than a set stain on a shrunken one.

  • How longAn overnight soak
  • RepeatingTwo long soaks, then accept the result.
  • Stop ifthe mark has gone, or two long treatments have left it unchanged

What not to use on blanket

  • Washing it hot, tumble drying or ironing before the mark has gone

    Baby sick is mostly milk protein and heat coagulates protein into the fibre. A 60 degree wash on a mark that has not lifted is the single most common way a removable stain becomes a permanent one, and the cleaning trade body's own advice is to keep the item out of the dryer until it is clean.

  • Rubbing at the mark with a nail brush

    Cotton takes firm handling, but a stiff brush breaks fibre ends and raises a fuzzy patch that catches the light and reads as a mark long after the stain has gone.

  • Reaching for chlorine bleach on a coloured item

    It strips dye in a patch and there is no way back. On white cotton it is an option, but an oxygen product does the same job on milk yellowing without the risk, and bleach must never meet vinegar or an ammonia cleaner.

  • Biological detergent on a wool blanket

    Wool is protein and the enzymes digest it. If you cannot establish what the blanket is made of, treat it as wool and use a neutral detergent.

  • A tumble dryer

    It sets the stain, mats acrylic and fleece, and felts wool. A blanket dries perfectly well spread out with air moving.

White compared with coloured blanket

Baby blankets are usually pale and take an oxygen soak well if they are cotton or acrylic. Cellular cotton blankets in particular are almost always white or pastel and colourfast. Wool blankets are the exception on every count: no bleach of any kind, no oxygen powders and no biological detergent, because all three attack the fibre rather than only the dye.

Products that genuinely help here

Try the household route above first. These are worth buying only when it is not enough.

  • Optional product

    Vanish Oxi Action Stain Remover Powder for Colours, 2.4 kg

    For a cotton or acrylic blanket, not a wool one

    Once the protein has gone, what is left on a milk mark is oxidised fat, which shows as a yellow shadow and which enzymes do nothing to. An oxygen based soak is the correct escalation for that, and being chlorine bleach free it can be used on coloured items where household bleach would strip the dye.

    Worth knowing. Not on wool. Oxygen powders weaken wool fibre even though they are gentler than chlorine bleach.

    Check current price Checked 6 October 2026

    View at Amazon UK Paid link

If the mark is still there

Dry it properly before judging it, spread out with air reaching both sides. A blanket that looks marked while damp very often looks fine dry.

If a mark remains on a cotton or acrylic blanket, a longer soak is safe and usually works. On a wool blanket, a long soak in cool water with wool detergent is the only repeat available, and two is the sensible limit.

Smell is the more common survivor on a blanket, because the item is thick and the middle takes a long time to rinse. Rinsing for longer than feels necessary, and drying with air moving through it rather than draped over a rail, deals with most of that.

When to stop and call someone

Use a launderer rather than continuing if the blanket is wool and two neutral soaks have failed, if it is too large to handle wet, or if it is a good wool blanket where felting is a real risk. Say it is a milk stain so they treat it as protein.

Why baby sick behaves this way on blanket

A blanket is a large item with a straightforward stain and one important decision in it.

The fibre decides the detergent

Cotton and acrylic are not protein, so biological detergent is safe and is the most effective thing available. Wool is protein, and the same product digests it. This is the only genuinely consequential choice on the page.

Size makes it awkward

A blanket does not fit in a sink and a wet one is heavy. A bath is the right vessel, and the weight needs supporting when lifting so a wool or knitted blanket does not stretch.

Thickness slows the rinse

Detergent and residue stay in the middle of a thick blanket long after the surface runs clear, which is where a lingering smell comes from.

Heat is excluded twice

It sets the protein, it mats acrylic and fleece, and it felts wool.

Sources

What we checked and when. Where a manufacturer instruction disagrees with anything here, follow the manufacturer.

  1. How to remove stains from baby clothes, Persil UK manufacturer

    UK manufacturer guidance to act quickly on formula, blot when immediate washing is impossible, rinse under cool water, soak for at least 15 minutes where the care label permits, pre-treat with detergent and then wash to the care label.

    Checked 7 September 2026

  2. A guide to newborn laundry, American Cleaning Institute trade body

    Cleaning trade body guide to pre-treat breast milk, formula or spit-up with an enzyme stain remover, soak fresh marks for at least 30 minutes and older marks for several hours, launder, and keep stained items out of the dryer until the mark has gone.

    Checked 7 September 2026

  3. How to remove baby formula stains, Purex Stain Lab manufacturer

    Manufacturer guidance identifying breast milk, formula and baby spit-up as protein stains, explaining the role of enzymes, and warning that the mark should be checked before any drying heat because heat sets what remains.

    Checked 7 September 2026

  4. How to care for linen, FatFace retailer

    UK retailer care guidance that linen is washed in cold or lukewarm water at 30 C or lower to avoid shrinking, on a delicate or hand wash setting to reduce agitation, with a gentle detergent free of bleach and brighteners, that fabric softener coats the fibres and reduces breathability, and that bleach weakens linen fibres.

    Checked 7 September 2026

  5. Norovirus: what to do and how to stop the spread, UK Health Security Agency authority

    UK public health guidance establishing that illness related vomit can carry norovirus, that contaminated laundry should be washed with normal powder at 60 C where the care label permits, and that compatible hard surfaces should be disinfected with a bleach based product.

    Checked 7 September 2026