Stain

Blood stains

A protein stain that lifts easily in cold water while it is wet, and bonds into the material permanently the moment heat reaches it.

  • TypeProtein
  • Heat sets itYes
  • Reviewed1 September 2026

If it has just happened, whatever it is on

Put gloves on if the blood is not your own, then blot with a dry cloth and flush with cold water. Cold, not warm, and keep going until the water coming away is clear. On anything that cannot be flushed, blot with cold water on a cloth, working from the outside of the mark inwards.

Do not do this

No hot water, no tumble dryer, no iron, no steam and no hot wash until the mark has completely gone. Do not rub, which spreads the mark and pushes it deeper. Do not mix chlorine bleach with vinegar, limescale remover or an ammonia based glass cleaner.

Blood on specific materials

Blood behaves the same way on every material, which makes it one of the more predictable stains once the rule is clear. Cold water while it is wet. Nothing warm until it has gone.

Why heat is the whole problem

The protein in blood coagulates when it is heated. A coagulated protein is a different, tougher structure that grips the fibre or the pore it is sitting in, and no amount of soaking afterwards reverses it. A wash at forty degrees, a spin in the dryer or a pass with an iron will all do it. So will pouring a kettle over it, which is advice that circulates surprisingly widely.

Time matters less than temperature

A fresh mark left to air dry is still mostly recoverable, because drying is not the same as setting. Soaking softens dried blood and it goes back into solution. A mark that has been through a warm wash is a different problem, and on some materials it is a permanent one.

Treat it as a biological hazard if it is not yours

Blood can carry bloodborne viruses. If the blood is not your own, wear disposable gloves, cover any cut or graze on your hands with a waterproof dressing first, and wash your hands afterwards.

How blood behaves

Blood is mostly water carrying protein, and the colour comes from haemoglobin inside the red cells. Protein is the part that matters. Warm it and it coagulates, the same way an egg white turns solid, and once it has coagulated inside a fibre or a pore it is bonded there rather than sitting in it.

That is why every reliable method for blood is a cold one, and why the usual instinct to reach for hot water is the single most expensive mistake available.

Sources

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

  1. Persil UK, how to remove blood stains from clothes manufacturer

    Manufacturer instruction to use cold water only because hot water sets the proteins, to soak in cold salted water at one or two tablespoons of salt per litre for several hours, and not to wash hot until the mark has gone.

    Checked 1 September 2026

  2. How to remove blood from carpet, National Carpet Cleaners Association trade body

    UK trade body guidance that cold water matters on carpet because warmth speeds clotting, that marks are blotted rather than rubbed, and that a hidden patch is tested first.

    Checked 1 September 2026

  3. Enzymes in laundry detergents, University of Maryland publication

    Explains that proteases hydrolyse the peptide bonds holding a protein together, which is the mechanism a biological detergent uses on a blood mark that plain detergent will not shift.

    Checked 1 September 2026

  4. Standard infection control precautions, NHS Scotland national manual authority

    Establishes that gloves and an apron are worn where contact with blood is anticipated, and that cuts and grazes are covered with a waterproof dressing before the work starts.

    Checked 1 September 2026

  5. Safe management of blood and body fluid spillages, Infection Prevention Control authority

    Gives household bleach at one part in ten of cold water for blood on a hard surface, and states plainly that chlorine disinfectants must not go on soft furnishings, untreated wood or carpet because they bleach them.

    Checked 1 September 2026