The Stain Library

Material

Sports kit

Polyester with elastane and applied badges. Easy chemistry, but heat destroys the stretch and lifts the transfers.

  • SurfacePorous
  • WashingMachine
  • Colour run riskMedium
  • Reviewed7 September 2026

What sports kit can and cannot take

  • Heat Use with care
  • 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 sports kit

Cool water, biological detergent and a soak. The fabric is polyester, so the milk sits on the surface rather than inside the fibre and comes out readily.

What needs protecting is the elastane, which heat and chlorine destroy, and the badge, which is usually a heat applied vinyl transfer that lifts if it is ironed or scrubbed.

Skip fabric softener, which clogs the wicking finish that sports fabric depends on.

Check the label

Sports kit is polyester with elastane and usually a printed or heat pressed badge. The fabric takes cool washing well, the elastane rules out heat and chlorine, and the print rules out ironing the face and any strong solvent.

Stains on sports kit

Sports kit is technical fabric with decoration applied to it, and both parts constrain the method.

The fabric is easy

Polyester does not absorb, so a cool soak with enzymes reaches the whole mark. This is one of the more straightforward fabrics for milk.

The elastane is not

Heat and chlorine both break elastane down, and when they do the kit goes baggy rather than discoloured. Cool washing and air drying are the whole protection.

The badge is vinyl

Numbers, names and club badges are usually heat pressed vinyl. An iron lifts them, a hot dryer curls them and scrubbing peels them. Work around the badge, not over it.

Softener kills the wicking

Sports fabric has a finish that moves moisture. Fabric softener coats it and stops it working, which matters more on kit than on anything else here.

Sources

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

  1. 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

  2. How to wash swimwear, Simply Swim retailer

    UK swimwear retailer guidance to rinse swimwear by hand in cold water after every use because water alone does not remove chlorine or salt, never to use chlorine bleach because chlorine resistant does not mean chlorine proof, never to machine wash or tumble dry swimwear even once, never to iron it because high temperatures make the fabric disintegrate, and to air dry it in the shade allowing 24 hours between wears for the elastane to recover.

    Checked 7 September 2026

  3. 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