Material
Plastic
A non porous surface where the milk mark is a deposit rather than a stain, so the risks are scratching and solvent damage rather than staining.
- SurfaceNon porous
- WashingSpot only
- Colour run riskLow
- Reviewed7 September 2026
What plastic can and cannot take
- Heat Avoid
- Water and soaking Tolerates it
- Acids, including vinegar Tolerates it
- Strong alkalis Tolerates it
- Solvents Avoid
- Chlorine bleach Use with care
- Abrasives Avoid
General rules for plastic
Treat this as washing rather than stain removal, because nothing has soaked in.
Warm soapy water, a soft cloth and time. If the mark is dried on, more time rather than more force, because scratching a plastic surface is the one lasting damage available.
Keep solvents away. White spirit, acetone and nail varnish remover attack many plastics and leave a permanently dull or sticky patch.
Check the label
Almost nothing soaks into a hard plastic, so a milk mark is a deposit rather than a stain and warm soapy water removes it. The two real risks are scratching, which is permanent and holds dirt, and solvents, which craze or dissolve the surface.
Stains on plastic
- Baby sick Lift the solids with a plastic scraper, then wash with warm soapy water and a soft cloth. Nothing absorbs int...
- Blood Blot first, then use cold water and a tiny amount of compatible detergent. Work from the edge, rinse or blot...
- Body oil Lift free oil from plastic, then clean a small area with a maker-approved mild detergent solution and a soft...
- Breast milk Blot the spill, identify the finish and use a controlled cold clean only where permitted. Where the maker per...
- Bronzer Lift loose bronzer from plastic before it is rubbed in. Blot cream bronzer, follow the material or care label...
- Coffee Wipe coffee off plastic promptly with a soft cloth. Check the finish and maker care rules first. Do not treat...
- Concealer Lift thick concealer from Plastic, blot without rubbing, then use a very small amount of diluted washing-up l...
- Cooking grease Lift and blot cooking grease from Plastic, then use a small amount of diluted washing-up liquid only if the m...
- Deodorant Lift loose deodorant from plastic with a dry white cloth, then wipe the remaining film with cool water and on...
- Hair dye Blot hair dye from Plastic, test the mildest compatible cool detergent route, clean inwards, remove residue a...
- Lipstick Lift lipstick from Plastic with a blunt edge, blot without rubbing, then use a very small amount of diluted w...
- Motor oil Blot motor oil from Plastic, absorb as much as possible, then use a small amount of diluted washing-up liquid...
- Nail polish Lift free polish gently if the face permits contact. A maker-approved mild damp wipe can clear loose residue,...
- Period blood Lift any tissue with a spoon edge, then blot. Use cold water and a tiny amount of compatible detergent for th...
- Pet urine Blot until nearly dry, then use only the cool-water quantity plastic can tolerate. Use a labelled pet urine e...
- Sweat Blot sweat from Plastic, test a weak cool detergent wipe, remove residue with minimal moisture and dry prompt...
- Tomato sauce Lift tomato sauce from Plastic, then wipe or blot inwards with a tested cool detergent solution. Remove resid...
Hard plastics in a house are mostly polypropylene, polyethylene, ABS and polystyrene.
Nothing absorbs
Which makes this one of the easiest surfaces on the site. Everything is on top and comes off with detergent and time.
Scratching is the permanent fault
Plastic is soft. An abrasive pad leaves fine scratches, dirt collects in them, and the item then looks dirty however well it is washed.
Solvents attack it
Different plastics are vulnerable to different solvents, and there is no way to know which is which by looking. Since a solvent achieves nothing on milk, there is no reason to find out.
Heat distorts it
Many household plastics soften well below boiling, and a dishwasher's drying cycle is hot enough to warp thin items.
Sources
What we checked and when. Where a manufacturer instruction disagrees with anything here, follow the manufacturer.
-
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
-
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
-
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