The Stain Library

How to remove baby sick from silicone

  • DifficultyEasy
  • OutlookUsually removable
  • MaterialSilicone
  • Reviewed7 September 2026

The short answer

Wash it in warm soapy water and it will come clean, because silicone is chemically inert and non porous. The characteristic problem is not the stain but the smell and a slightly greasy film, both of which survive an ordinary wash. A bicarbonate of soda paste left on for an hour, or a soak in hot water with dishwashing granules, deals with both. Rinse thoroughly on anything a baby feeds from.

If it has just happened

Rinse it in warm water and wash it with detergent. Silicone releases a fresh mark easily, and the sooner it is off, the less smell is left behind.

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.

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 scraper or spatula Plastic, not metal. A scratched plastic surface holds dirt in the scratches for good.
  • Kitchen roll For lifting the bulk before any water is involved.
  • Warm soapy water Warm rather than hot, and washing up liquid rather than anything stronger.
  • A soft cloth or a soft nylon brush Soft. Nothing green, nothing wire and nothing gritty.

Helpful but not essential

  • Bicarbonate of soda A mild paste for a textured surface or a lingering smell.

Fresh baby sick on silicone

Nothing absorbs, so this is washing rather than stain removal.

  1. Lift the solids off with a plastic scraper

    Plastic rather than metal, so the surface is not scored. Straight into a bag rather than wiped along the surface.

  2. Wash with warm soapy water

    Warm rather than hot, because heat sets milk protein and can distort a plastic. Washing up liquid and a soft cloth is the whole product list.

  3. Work any texture or seam with a soft brush

    Moulded plastics have corners, ribs and seams where a cloth passes over. A soft nylon brush reaches them without scratching.

  4. Rinse and dry

    Rinse thoroughly under warm running water, and rinse again on anything a baby feeds from, then dry it before storing.

  • How longFive minutes
  • RepeatingOne wash is normally enough.
  • Stop ifthe surface is clean, rinsed and dried

Dried baby sick on silicone

Soak it. Dried milk on a non porous surface softens off completely given a little time.

  1. Soak rather than scrape

    Warm soapy water left on the mark for ten or twenty minutes lifts dried milk off a plastic surface. Scraping at it is how these surfaces get scratched.

  2. Wipe it away with a soft cloth

    If it is not moving, leave the water on it longer. There is no stain in the material, so time always works eventually.

  3. Use a bicarbonate paste on a textured area

    A little bicarbonate of soda mixed to a paste is mildly abrasive at worst and mildly alkaline, which suits milk residue and does not scratch.

  4. Rinse thoroughly and dry

    Rinse thoroughly under warm running water, and rinse again on anything a baby feeds from, then dry it before storing.

  • How longTwenty minutes
  • RepeatingSoak again rather than scrubbing harder.
  • Stop ifthe residue has softened and washed off without any scratching

Old or set in baby sick on silicone

An old mark on plastic is usually a smell or a stain in the surface texture.

  1. Give it a long soak in warm soapy water

    Several hours or overnight. On plastic, contact time does everything that scrubbing would and none of the damage.

  2. Then an oxygen soak if the item allows it

    An oxygen based product in warm water lifts the yellowing that milk fat leaves on plastic. It is far gentler than chlorine bleach and it does not attack the material.

  3. Deal with the smell separately

    Bicarbonate of soda paste left on the surface for an hour, then rinsed, takes out a sour smell that washing has not.

  4. Then weigh it against replacing the item

    Most things in this family are inexpensive and are meant to be replaced when they are worn. A scratched, stained or smelling plastic item is usually at the end of its life rather than in need of another treatment.

  • How longOvernight
  • RepeatingOne long soak, then accept it or replace the item.
  • Stop ifthe surface is clean and free of smell, or the item is worn enough to replace

What not to use on silicone

  • Abrasive pads, scouring powder and wire wool

    Plastics are soft and scratch easily, and a scratched surface holds residue in the scratches and looks progressively worse. On a food surface, scoring also gives bacteria somewhere to live.

  • Solvents, white spirit and nail varnish remover

    Many plastics are attacked directly by solvents, which produces a permanently dull, sticky or crazed patch. There is nothing a solvent achieves on a milk mark that warm soapy water does not.

  • Very hot water and dishwasher cycles before the mark has gone

    Milk protein sets with heat, and heat also distorts or crazes many plastics. Deal with the mark warm, and use the dishwasher afterwards if the item is dishwasher safe.

  • Scrubbing it with an abrasive pad to remove the tacky feeling

    The tackiness is an oil film, not damage, and scrubbing scratches the surface without removing it. A hot soak with dishwashing granules is what actually works.

White compared with coloured silicone

Silicone is usually a solid colour and does not stain. What it does is hold a slight film that makes the surface feel tacky and attract dust, and people read that as the item being dirty. It is a residue rather than a change to the material, and it comes off with a hot soak and a proper rinse.

If the mark is still there

If it still smells, that is the normal outcome rather than a failure. Silicone has an affinity for oils, which is why silicone bakeware smells of what was baked in it.

The two effective treatments are a bicarbonate of soda paste smeared on and left for an hour, then rinsed, and a soak in hot water with dishwashing granules. Both work better than repeated washing.

On baby teats, bottles and bibs, rinse far more thoroughly than for kitchenware, because residue on silicone is noticeable and these items go in a mouth. If a smell survives both treatments on a feeding item, replace it, because teats are consumables.

When to stop and call someone

There is no professional route for silicone. Replace a teat, a bib or a lid seal rather than persisting if a smell survives a bicarbonate treatment and a hot soak, particularly on anything a baby feeds from, where the standard is higher than for kitchenware.

Why baby sick behaves this way on silicone

Silicone is a polymer with a silicon and oxygen backbone rather than a carbon one, which is why it behaves so unlike plastic.

It is chemically inert

Acids, alkalis and detergents do not attack it, which is why it is used for baby teats, bakeware and seals.

Heat tolerance does not help here

Silicone survives oven temperatures, but the milk protein still sets, so the material's toughness makes no difference to the order of operations.

It holds smells and oils

The surface has a slight affinity for oils, which is the source of the lingering smell and the tacky film. That is characteristic rather than a fault.

It attracts dust

Which people mistake for the item being dirty when it is actually just silicone behaving normally.

Sources

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

  1. Melamine dinnerware and staining, G.E.T. manufacturer

    Melamine manufacturer guidance that staining is caused by food left to dry on the surface and by protein and hard water minerals building up, that an oxygen releasing soak or an overnight soak in warm water with dishwashing granules removes the stains, that a non abrasive pad is used afterwards, and that bleach, green scouring pads, steel wool and metal scourers must not be used because they dull and scratch the surface.

    Checked 7 September 2026

  2. Bathroom care guide, Carryduff Designs manufacturer

    UK bathroom supplier guidance that acrylic is softer than china and scratches, that scouring products are not recommended, that chemicals including nail varnish remover, household bleach, perfume and strong disinfectant must never be used on acrylic, that warm soapy water or a mild cream cleaner is the correct clean, that mild limescale removers are acceptable occasionally, that bleach must not go in a cistern, and that cleaners must never be mixed because they give off poisonous gas.

    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