The Stain Library

How to remove baby sick from paper

  • DifficultyDifficult
  • OutlookRarely removable
  • MaterialPaper
  • Reviewed7 September 2026

The short answer

Do not wipe it. Wet paper tears and the surface skins off under any rubbing. Lift solids off with a soft brush once dry, lay the sheet face up on clean absorbent paper with a fan circulating air in the room rather than blowing at it, and let it dry flat. If it cannot be dried within a couple of days, freeze it in a bag, which stops mould and buys time.

If it has just happened

Get the sheet flat and face up on clean absorbent paper, and do not touch the wet surface. Everything you do in the first minute is about moving the sheet, not about cleaning it.

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.

If you cannot dry it within two days, freeze it

Archives freeze wet paper that cannot be dried quickly, because mould begins within about forty eight hours and mould on paper cannot be undone. Freezing does not treat anything, it stops the clock. Bag the item, freeze it, and deal with it or get advice when you have time. The exception is photographs, where prints can be frozen interleaved with waxed paper but glass plate negatives and tintypes must never be frozen at all.

What you will need

  • Disposable gloves Sickness that came with a stomach bug is a hygiene job, and clean dry hands matter on paper anyway.
  • A soft brush For lifting dry material off. This is the main tool.
  • Clean white blotting paper or kitchen roll For absorbing, laid against the surface rather than rubbed on it.
  • A fan Air circulation is what dries paper. Not aimed straight at it.

Helpful but not essential

  • Unprinted newsprint or kitchen roll for interleaving Absorbent and free of ink that could transfer.
  • A freezer bag Freezing buys time when something cannot be dried within a couple of days.

Fresh baby sick on paper

Move the sheet, support it, and let it dry. There is no cleaning stage on wet paper.

  1. Lift the sheet by two corners and lay it flat

    Support it from underneath with a piece of card if it is heavily wet, because wet paper tears under its own weight.

  2. Lay it face up on clean absorbent paper

    Unprinted newsprint, blotting paper or plain kitchen roll. Face up, so nothing is laid against the marked surface.

  3. Let the absorbent material do the work

    Do not press anything onto the wet surface. The paper underneath draws moisture out on its own, and it is changed for a dry sheet as it dampens.

  4. Circulate air in the room

    A fan in the room rather than aimed at the sheet, which is what archives specify. Not a hairdryer and not a radiator.

  • How longTen minutes, then a day or two of drying
  • RepeatingChange the absorbent sheet underneath as it dampens.
  • Stop ifthe sheet is drying flat on dry absorbent paper with air moving in the room

Dried baby sick on paper

Only once the paper is completely dry does a soft brush become safe to use on it.

  1. Check the paper is fully dry and sound

    Flex a corner gently. Paper that feels soft, fluffy or fragile should be left alone, because conservators warn that surface cleaning abrades weak paper.

  2. Brush the residue off with a soft brush

    Support the sheet on a flat surface and work from the centre outwards, which is the direction conservators use so the sheet is not dragged.

  3. Try a soft eraser only on sound plain paper

    Very light pressure, small circles, never over ink or print. Stop immediately if the surface begins to fuzz.

  4. Flatten it under a weight

    Between two clean absorbent sheets with a book on top for a few days. This is the safe way to deal with cockling, and it only works once the paper is dry.

  • How longFifteen minutes
  • RepeatingOne careful pass. Do not go back over weak paper.
  • Stop ifthe loose residue is off and the paper surface is intact

Old or set in baby sick on paper

For anything that matters, this is where it goes to a conservator.

  1. Make sure it is stable first

    Dry, flat, and stored away from damp. A stable stained document is a document that can still be treated later.

  2. Photograph or scan it

    Whatever happens next, a good digital copy costs nothing and preserves the content even if the object cannot be restored.

  3. Then decide whether it warrants a conservator

    Washing and bleaching paper are genuine conservation procedures, carried out after testing the paper and the media. They work, and they are not something to approximate at home.

  • How longA day, then a phone call
  • RepeatingDo not attempt bleaching or washing.
  • Stop ifthe item is stable and dry and either accepted as it is or with a conservator

What not to use on paper

  • Rubbing or wiping the surface

    Wet paper is very fragile and the surface skins off under a cloth. Conservators treat surface cleaning as a dry mechanical process with soft brushes, and even then warn that it can abrade weak paper.

  • Adding water, detergent or any cleaning product

    Water spreads the stain, cockles the sheet and can lift or run the ink. There is no household product that improves a stain on paper and several that destroy it.

  • A hairdryer, a radiator or direct sunlight

    Heat sets milk protein, cockles and embrittles paper, and can cook a photographic emulsion. Archives specify circulating air rather than heat for exactly this reason.

  • Ironing it flat

    It sets the stain permanently, scorches paper and melts emulsions and coatings. Flattening under weight after drying is the safe equivalent.

  • Bleach, hydrogen peroxide and stain removal pens

    These are used in professional paper conservation under controlled conditions and they weaken and yellow paper when used blind. On anything that matters, they are how a stain becomes a hole.

  • Blotting the wet surface with kitchen roll pressed on top

    It sounds harmless and it lifts the surface of the paper with it. Lay the sheet on absorbent material instead and let it draw the moisture downwards.

White compared with coloured paper

Ink, print and pigment on paper all move when wet, so the mark you can see is not the only thing at risk. Water spreading outwards from a treated area carries dissolved ink with it and produces a tide line that is often darker than the stain. That is why archives dry paper rather than washing it, and why household stain removers, which are all wet, have no place here.

If the mark is still there

Wait until it is completely dry before doing anything else, which usually means a day or two rather than an afternoon.

Once dry, a soft brush and, on sound paper, a soft eraser lift a surprising amount of surface residue. Conservators call this surface cleaning and treat it as a dry mechanical process, worked from the centre of the sheet outwards with the paper supported underneath. They also warn that it abrades weak paper, so a sheet that feels soft or fluffy is one to leave.

Flatten a cockled sheet by leaving it under a weight between clean absorbent sheets for a few days, once it is fully dry. Never press it damp.

If the document matters, a paper conservator can wash and treat it under controlled conditions after testing the paper and the media. That is a real and effective service, and it is the only route that goes further than drying and brushing.

When to stop and call someone

Use a paper conservator rather than continuing if the document has any legal, historic, financial or sentimental value, if the ink has run, if several sheets are stuck together, or if mould has appeared. Washing and bleaching paper are genuine conservation procedures carried out after testing the paper and the media, and they are not household jobs.

Why baby sick behaves this way on paper

Paper is a mat of cellulose fibres held together largely by their own bonding, and water releases those bonds temporarily.

Wet paper has almost no strength

Archives open with this point. A sheet tears under its own weight and the surface lifts under a cloth, so the instinct to dab at a mark removes the paper along with it.

Drying is the treatment

Air circulation over absorbent blotting material is the archival method. The fan is placed to move air in the room rather than to blow directly at the sheet, because a direct draught curls and tears wet paper.

Freezing stops the clock

Mould begins within about two days on damp paper and cannot be undone. Freezing is the standard way to buy time and it needs nothing more than a bag and a domestic freezer.

Stain removal is a controlled procedure

Conservators do bleach and wash paper, after testing the sheet and the media and with the means to neutralise afterwards. Applying a household bleach or a stain pen blind is how a stain becomes a hole.

Sources

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

  1. Emergency salvage of flood damaged family papers, US National Archives authority

    National archive guidance that paper is very fragile when wet and must be handled carefully, that wet material is air dried on absorbent blotting material with fans circulating air but not blowing directly onto it, that books are stood open on edge with interleaving replaced as it absorbs moisture, that material which cannot be dried within two days should be frozen to stop mould, and that photographic print surfaces must not be touched.

    Checked 7 September 2026

  2. Surface cleaning of paper, Northeast Document Conservation Center authority

    Conservation centre guidance on dry surface cleaning of paper, establishing that surface cleaning is a mechanical dry process using soft brushes and erasers rather than liquids, that it is carried out with the object supported and worked from the centre outwards, and that it can abrade or skin weak paper and media, so friable, coated and damaged surfaces are left to a conservator.

    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. 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