Material
Polycotton
A blend that absorbs like cotton and is heat limited like polyester, so it stains readily and has to be treated cool.
- SurfaceSemi porous
- WashingMachine
- Colour run riskLow
- Reviewed7 September 2026
What polycotton can and cannot take
- Heat Avoid
- Water and soaking Tolerates it
- Acids, including vinegar Tolerates it
- Strong alkalis Tolerates it
- Solvents Use with care
- Chlorine bleach Use with care
- Abrasives Use with care
Always test on a hidden area first and let it dry before you treat the visible mark.
General rules for polycotton
The cotton half absorbs, so a milk mark goes into the fabric rather than sitting on it, which makes prompt cold rinsing more valuable here than on pure polyester.
The polyester half sets the temperature ceiling, and it also holds the fatty part of milk, which is where a yellow shadow on an old mark comes from.
Biological detergent and a long cool soak handle both halves. Heat handles neither and ruins both.
Check the label
Polycotton behaves like cotton for absorbency and like polyester for heat, which means it stains like the first and has to be treated at the temperature of the second. The blend ratio is on the label and it tells you which half dominates.
Stains on polycotton
- Baby sick Rinse from the back in cold water, work biological detergent into the mark and soak it for at least half an h...
- Blood Blot first, then use cold water and a tiny amount of compatible detergent. Work from the edge, rinse or blot...
- Body oil Blot polycotton, pretreat a permitted washable patch with liquid detergent, rinse and use a cool labelled was...
- Breast milk Blot and cold-rinse a label-approved washable item. Use your compatible biological liquid detergent and a per...
- Bronzer Lift loose bronzer from polycotton before it is rubbed in. Blot cream bronzer, follow the material or care la...
- Coffee Blot first. If the label permits, gently rinse cool water through the back of the mark, supporting the fabric...
- Concealer Lift the concealer, flush Polycotton from the back with cool water, pre-treat the oily residue with one drop...
- Cooking grease Lift and blot cooking grease from Polycotton, absorb the oil, pretreat both sides with washing-up liquid for...
- Deodorant Rub a fresh white deodorant mark off polycotton while it is dry. For residue that remains, follow the care la...
- Hair dye Blot Polycotton, flush cool water through the back, pretreat with liquid detergent, wash to the care label an...
- Lipstick Lift lipstick from Polycotton, work from the reverse with a drop of washing-up liquid, rinse cool, wash to th...
- Motor oil Blot motor oil from Polycotton, absorb the residue, pretreat both sides with a little washing-up liquid, wash...
- Nail polish Lift free polish without rubbing. A small mark on plain washable compatible cloth may respond to the linked l...
- 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 polycotton can tolerate. Use a labelled pet urin...
- Sweat Rinse fresh sweat from the back of Polycotton with cool water, pretreat retained residue, wash to the care la...
- Tomato sauce Lift tomato sauce from Polycotton, flush from the reverse with cool water, pretreat the remaining film, wash...
Polycotton is cotton and polyester spun or woven together, and it inherits properties from each.
Cotton absorbs, polyester does not
The cotton fibres take the milk into themselves, which is why a polycotton shirt shows a milk mark more than a pure polyester one does. Prompt cold rinsing matters correspondingly more.
Polyester sets the temperature
The blend cannot be washed hotter than the polyester tolerates, so the cotton half never gets the hot wash that would normally deal with it. That is fine here, because heat would set the stain anyway.
The yellowing comes from the polyester
Milk fat clings to polyester. An old milk mark on polycotton often ends up as a faint yellow patch after the protein has gone, and an oxygen soak is the answer to that rather than more enzymes.
It is what most bedding and uniform is
Which is why it appears so often after a baby has been sick.
Sources
What we checked and when. Where a manufacturer instruction disagrees with anything here, follow the manufacturer.
-
How to clean polyester and synthetics, Woolite
manufacturer
Detergent manufacturer guidance that polyester is washed, dried and ironed at low to medium heat only because excessive heat can melt the fibres, that air drying is preferred to machine drying, that nylon is washed in cool water on a gentle cycle because repeated machine washing causes discolouration and loss of shape, and that acrylic knits are laid flat or dried at low temperature to keep their shape.
Checked 7 September 2026
-
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
-
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