The Stain Library

How to remove baby sick from terrazzo

Published by The Stain Library. How we research our methods.

  • DifficultyModerate
  • OutlookOften removable
  • MaterialTerrazzo
  • Reviewed7 September 2026

The short answer

Blot it up immediately, because the terrazzo trade body warns that spills need immediate cleanup since terrazzo stains. Clean with a neutral product, which the trade body defines as pH 7 to 10, or a little washing up liquid in warm water. Avoid acids and harsh alkalis, avoid all purpose cleaners containing crystallising salts, which leave a haze, and keep abrasives off the polished surface.

If it has just happened

Blot it up straight away. The trade body is specific that terrazzo stains and that spills need immediate cleanup, and on a polished floor that is genuinely most of the job.

Avoid heat while treating the stain

Avoid adding heat while treating this stain. Follow the material's care instructions and the method below; heat may make a mark harder to remove or damage the material or its finish.

Test on a hidden area first

Use only a cleaner allowed by the material's care instructions. Test it on an inconspicuous area with the same material and finish, or a matching offcut. Let the test area dry and check for changes in colour, texture or finish 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 plastic spatula or a spoon Plastic, not metal. Metal scores stone and leaves a grey mark on pale surfaces.
  • Kitchen roll and soft cloths For blotting rather than wiping, because wiping spreads a spill across more porous surface.
  • Warm water and washing up liquid What this is A little mild detergent in warm water is the routine clean the stone trade body specifies.
  • Bicarbonate of soda The absorbent half of a poultice, and the safe way to lift a mark out of a porous stone.

Helpful but not essential

  • Hydrogen peroxide, 3 percent The active half of a poultice. The stone trade body names peroxide for organic stains.
  • Cling film and masking tape To stop a poultice drying out in the first few hours.

Fresh baby sick on terrazzo

Speed decides how much soaks in, and blotting decides how far it spreads.

Go carefully with warm water

Terrazzo tolerates warm water only within limits. Keep contact time short, work from the edge of the mark inwards and stop if the material changes.

  1. Blot, do not wipe

    Press kitchen roll onto the spill and lift. Wiping spreads it across more stone, and porous stone absorbs everything it touches.

  2. Lift the solids with a plastic spatula

    Plastic rather than metal, because metal scores stone and leaves a grey graphite-like mark on pale surfaces.

  3. Wash with mild detergent and warm water

    A soft cloth with a little washing up liquid in warm water, which is the routine clean the stone trade body specifies. Rinse with clean water and dry with a soft cloth.

  4. Look at it again once it is properly dry

    Stone looks darker while it is damp and can look clean when it is not. Give it a few hours, look in daylight, and only then decide whether anything has soaked in.

  • How longTen minutes, then look at it again dry
  • RepeatingBlot as long as it transfers.
  • Stop ifthe surface is clean and dry, or a shadow remains once it has dried, in which case move to a poultice

Dried baby sick on terrazzo

A poultice draws the mark back out of the stone. It takes a day and there is no faster version.

Go carefully with warm water

Terrazzo tolerates warm water only within limits. Keep contact time short, work from the edge of the mark inwards and stop if the material changes.

  1. Clean and dry the area first

    Mild detergent and warm water, then let it dry completely. A poultice on a dirty or damp surface works on the dirt rather than on the stain.

  2. Mix the poultice

    Mix bicarbonate of soda with a little warm water and a drop of washing up liquid into a paste about the consistency of thick yoghurt. On a stone or a colour where peroxide might lighten the surface, this plain version is slower and carries no bleaching risk.

  3. Cover it and leave it

    Spread the paste about half a centimetre thick over the mark and a little beyond it, cover with cling film taped at the edges, and leave it for a day. The film stops it drying out in the first few hours, which is when it does most of its work.

  4. Lift it off and let the stone dry

    Take the film off, let the paste dry completely, then lift it with a plastic spatula and wash the area. Judge the result only when the stone is dry.

  • How longTwenty minutes to apply, then 24 to 48 hours
  • RepeatingTwo or three applications on an older mark is normal.
  • Stop ifthe stone is clean when dry, or three poultices have made no difference

Old or set in baby sick on terrazzo

Repeats are normal. Knowing when to stop is the useful part.

  1. Repeat the poultice, fully dry in between

    Stone specialists describe two or three applications on an older mark as normal rather than a sign that anything is wrong. Let the stone dry completely between them.

  2. Check whether it is a stain or damage

    A stain is darker than the stone around it. Etching is duller rather than darker, and it is acid damage to the surface. No poultice touches etching.

  3. Look at it dry, in daylight

    Damp stone is impossible to judge. Every decision here is made on dry stone by a window.

  4. Then call a stone restorer

    They can hone and repolish an area, which is a different set of tools rather than a stronger bottle. On a floor, a worktop or a fireplace, a patch that does not match is worse than the mark, so this is a judgement worth paying for.

  • How longA day per application
  • RepeatingThree poultices, then a stone specialist.
  • Stop ifthe mark has gone, or three full poultices have not moved it

What not to use on terrazzo

  • Scouring powder, cream cleaner and wire wool

    The stone trade body warns that scouring powders and creams contain abrasives that scratch stone. On a polished or honed surface that shows as a permanent dull patch, which is worse than the stain.

  • Wiping a fresh spill rather than blotting it

    Wiping spreads liquid across more porous surface, and every extra square centimetre it touches is more stone for it to soak into.

  • Mixing bleach and ammonia, or peroxide and vinegar

    The stone trade body warns specifically that bleach and ammonia must never be mixed. Peroxide with an acid makes peracetic acid. Both combinations appear in stone cleaning advice for different purposes, so keep them apart.

  • A steam cleaner

    Steam forces moisture into a porous stone and into the joints, and heat sets milk protein at the same time.

  • Vinegar, lemon juice, limescale remover and acidic bathroom sprays

    Acid dissolves the surface rather than marking it, leaving a dull etched patch that no cleaner removes because the polished layer has gone. Dilution and speed do not change this.

  • All purpose cleaners containing salts, and strong alkaline degreasers

    The terrazzo trade body warns against soaps containing water soluble or crystallising salts, which dry to a haze, and against harmful alkalis as well as acids. The safe range is pH 7 to 10.

White compared with coloured terrazzo

Terrazzo is chips of one colour in a matrix of another, so a treated patch shows as a change in the matrix rather than the chips. Peroxide lightens a cement matrix unevenly, and all purpose cleaners with salts in them dry to a visible bloom between the chips. Both faults appear as a hazy area rather than a clean one, which is why the trade body is specific about neutral products.

If the mark is still there

Look at it dry and from a normal standing height rather than up close. Terrazzo is a floor and the matrix between chips varies naturally.

If a shadow remains in a cement based terrazzo, a plain bicarbonate and water poultice is the low risk option and worth two or three applications. Resin based terrazzo is effectively non porous and should not need one at all, so a mark that persists on a resin floor is usually residue on the surface rather than a stain in it.

If the matrix has been etched, or chips have loosened, that is damage and terrazzo is ground and repolished rather than patched. A specialist doing a whole floor is how terrazzo is maintained and it is why these floors last for decades.

When to stop and call someone

Call a terrazzo specialist rather than continuing if the matrix has been etched, if chips have loosened, or if three poultices have not worked. Terrazzo is ground and repolished rather than patched, which is a specialist process and the reason terrazzo floors last for decades.

Why baby sick behaves this way on terrazzo

Terrazzo is stone or glass chips set into a binder and ground flat, so it is really two materials with one surface.

The matrix is the weak half

Cement based terrazzo has a calcareous binder that acid attacks, etching between the chips and eventually loosening them. Resin based terrazzo is non porous and far tougher. Old floors are usually cement, modern ones frequently resin.

The pH range is narrow

The trade body specifies pH 7 to 10, which excludes both acidic descalers and strongly alkaline degreasers. Most stone advice only warns about acid, so the alkali half is worth noticing.

Salts leave a bloom

All purpose cleaners containing crystallising salts dry to a haze on terrazzo, which the trade body names specifically.

Abrasives dull it

Including sand based sweeping compounds, which is an unusual warning and tells you how easily the polish marks.

Sources

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

  1. Care and cleaning of natural stone, Natural Stone Institute trade body

    Stone trade body guidance that calcareous stone such as limestone and travertine is sensitive to acid so only mild non acidic cleaners are used, that acidic cleaners are still not advised on granite, slate or sandstone because they can hold acid sensitive minerals, that scouring powders scratch stone, that the routine clean is a neutral cleaner or mild washing up liquid in warm water, that organic stains are treated with hydrogen peroxide, and that ammonia and bleach are never mixed.

    Checked 7 September 2026

  2. Sick happens: how to get vomit out of carpet, National Carpet Cleaners Association trade body

    UK carpet cleaning trade body method for vomit: scrape solids with a blunt spatula or spoon, apply equal parts white vinegar and water, blot gently working towards the middle of the mark rather than outwards, never scrub because that drives the vomit deeper and damages the carpet, use only a small amount of warm water on a dried mark, and expect rehydrating it to release the smell again so ventilate.

    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