The Stain Library

How to remove period blood from jersey

  • DifficultyEasy
  • OutlookUsually removable
  • MaterialJersey
  • Reviewed1 September 2026

The short answer

Lay the garment flat, flush the mark from the back with cold water, work in a drop of washing up liquid with your fingertips, then soak in cold water with biological detergent if it has dried. Wash at 30 degrees and dry flat or on a supported hanger. Do not scrub and do not hold a wet knit up by one corner.

If it has just happened

Blot with a white cloth, then hold the garment flat and flush the back of the mark under a cold tap. Support the wet fabric with your other hand rather than letting it hang, because a wet knit stretches and stays stretched.

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.

Test on a hidden area first

Try any cleaner on a hidden part of the material first, such as a seam, an offcut, inside a hem or under a piece of furniture. Wait for it to dry and check for colour change before treating the visible mark.

Blood that is not your own needs gloves

Your own menstrual blood carries no risk to you that it did not already. Someone else's does. Infection control guidance is to put on disposable gloves and an apron where contact with blood is expected, and to cover any cut or graze on your hands with a waterproof dressing before you start. That applies to a small mark on a sheet in a shared house as much as to a large spill.

What you will need

  • Two clean white cloths White, so no dye transfers into whatever you are treating.
  • Cold water
  • Washing up liquid One drop. More than that is harder to rinse out than the mark was.

Helpful but not essential

  • Disposable gloves Optional if the blood is your own, sensible if it is not.
  • Table salt One or two tablespoons per litre for a cold soak.
  • Biological laundry detergent The enzymes are what shift a dried mark that cold water alone has stalled on.
  • Hydrogen peroxide, 3 percent White and pale materials only, and test somewhere hidden first.

Fresh period blood on jersey

The knit works in your favour here. Flush from the back and it is usually done.

  1. Blot flat

    Lay the garment flat and press a dry white cloth onto the mark. Lift straight off rather than wiping.

  2. Flush the back, supported

    Turn it inside out and hold the mark under a cold tap, supporting the fabric with your hand underneath so it does not hang and stretch.

  3. Fingertips, not force

    One drop of washing up liquid spread with your fingertips for thirty seconds, then rinsed through cold. Do not rub the knit against itself here, which pills it.

  4. Reshape and wash at 30

    Squeeze the water out without wringing, shake the garment gently back into shape, then wash at 30 and dry flat or on a hanger with the shoulders supported.

  • How longFive minutes, plus a wash
  • RepeatingTwo or three flushes. No scrubbing between them.
  • Stop ifthe water running through is clear

Dried period blood on jersey

Soaking suits a knit better than any amount of local treatment.

  1. Cold salted soak, laid flat

    Cold water with one or two tablespoons of salt per litre in a bowl, garment laid in flat rather than bunched, for at least thirty minutes.

  2. Biological detergent on the mark

    Work a little into the damp area with fingertips and leave it fifteen to thirty minutes. Contact time does more than pressure.

  3. Rinse cold and check wet

    Rinse through, then look at the mark while the fabric is wet and in daylight. Wet fabric is a fair preview of the treated result.

  4. Wash at 30 and dry flat

    Wash cool, then reshape while damp and dry flat. Keep it out of the dryer.

  • How longThirty minutes to four hours, plus a wash
  • RepeatingTwo soaks.
  • Stop iftwo soaks leave it unchanged

Old or set in period blood on jersey

A washed in mark on jersey has limited routes, because the fabric will not take much.

  1. Overnight cold biological soak

    Pack dose in cold water, garment laid flat and submerged, overnight.

  2. Assess wet, in daylight

    Rinse and judge it wet. This is the point to decide whether to continue or stop.

  3. Oxygen route on white jersey only

    On white cotton jersey, dab 3 percent hydrogen peroxide on for five minutes and rinse cold, up to three times. Not on anything coloured, and never on a garment where elastane is a large proportion.

  4. Wash cool and reshape

    Wash at 30, shake back into shape while damp, and dry flat.

  • How longOvernight, plus a wash
  • RepeatingTwo attempts.
  • Stop ifan overnight soak makes no difference, or the surface starts to pill

What not to use on jersey

  • Anything warm before the mark has gone

    Heat coagulates the protein in blood inside the fibre or the pore it is sitting in, and nothing reverses that. A warm rinse, a hot wash, a tumble dryer, an iron, a steam cleaner and a hairdryer all do it.

  • Chlorine bleach

    It yellows cotton over time and destroys elastane outright, so a jersey garment treated with it loses its shape as well as its colour.

  • Scrubbing or brushing the knit

    It breaks the loops into short fibre ends and raises a permanent fuzz. A pilled patch is as visible as the mark was.

  • Holding wet jersey up by one corner

    A wet knit under its own weight stretches and does not recover. Treat it flat and support it while it is wet.

White compared with coloured jersey

Most jersey is cotton with a few percent elastane, and both the dye and the elastane are the reason to stay cool and gentle. On white cotton jersey an oxygen based soak or a dab of 3 percent hydrogen peroxide is available. On coloured jersey it is not, and chlorine bleach is out on all of it because it yellows cotton and destroys elastane. Test any oxidiser on an inside seam and let it dry before judging.

Products that genuinely help here

Try the household route above first. These are worth buying only when it is not enough.

  • Escalation

    Dr. Beckmann Stain Devil for blood, milk and protein, 50 ml

    For one spot on a garment you do not want to soak

    Soaking is the right escalation for jersey, and it is impractical when only one small area is marked and the garment is otherwise clean. A targeted protein remover reaches the same chemistry without a bowl and several hours, which suits a t shirt more than it suits bedding.

    Worth knowing. Oxygen based bleaching agents in it can lift dye. Test on an inside seam of anything coloured, and let the test dry before judging it.

    Check current price Checked 7 September 2026

    View at Amazon UK Paid link

If the mark is still there

Soak the whole garment flat in cold water with biological detergent for four hours or overnight, then wash cool. A soak is far better suited to a knit than repeated working of one area, because it treats the mark without abrading the loops.

If two soaks have stalled and the garment is white, dab 3 percent hydrogen peroxide on for five minutes and rinse cold, up to three times. On anything coloured there is no equivalent.

A jersey top that has been tumble dried with the mark on it has two problems: the protein has set and the elastane has probably slackened. A faint shadow is the realistic outcome.

When to stop and call someone

Take it to a cleaner if the garment is a jersey dress with a lining or structured shoulders that soaking would distort, if it is silk or viscose jersey rather than cotton, or if it is labelled dry clean only. Stop treating it yourself if the treated area is visibly fuzzier than the fabric around it.

Why period blood behaves this way on jersey

Jersey is a knit, and the loops make it behave differently from a woven cotton of the same weight. Liquid passes through the structure rather than being held in a tight weave, which is why flushing from the back is unusually effective here and why a fresh mark often disappears in under a minute.

The same structure creates the two risks. A wet knit under tension stretches permanently, so the garment is treated flat rather than held up. And the surface pills when it is scrubbed, because the loops break into short fibre ends that catch the light. A pilled patch is as visible as the stain was.

The elastane in most modern jersey is the least heat tolerant thing in the garment. Keeping to 30 degrees and staying out of the dryer protects the shape as well as the stain, so the two pieces of advice point the same way.

The protein chemistry itself is unremarkable: cold water while it is wet, enzymes once it has dried, nothing warm until it has gone.

Do the usual suggestions work?

  • Cold flush from the back Yes, it works

    A knit lets water straight through, so this works better on jersey than on most fabrics.

  • Cold soak with biological detergent Yes, it works

    The right escalation for a knit, because it needs no handling of the surface.

  • Hydrogen peroxide Sometimes

    Reliable on white cotton jersey. Not on colours, and not on anything with a high elastane content.

  • Rubbing the fabric against itself No, it is risky

    Standard advice for cotton and a poor idea on a knit, which pills rather than releasing the mark.

  • A hot wash to be safe No, it is risky

    It sets the protein and slackens the elastane in one cycle.

Common questions

It happened overnight and I only found it this morning. Is that too late?

No. Drying is not the same as setting. A mark that has dried but has never been heated has only gone out of solution, and cold water plus time brings it back. The thing that would make it too late is a warm wash or a tumble dryer, not the hours it sat there.

The neckline went baggy after I treated it. Can that be fixed?

Not reliably. Elastane that has been stretched while wet, or heated, does not recover. It is the reason for treating a knit flat and drying it flat, and it is a bigger risk on jersey than the stain is.

Why is it brown rather than red?

Menstrual blood is darker than a cut to begin with, because it is not freshly oxygenated, and the iron in it oxidises further as it dries. Brown means old, not set. It responds to the same cold soak.

Sources

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

  1. Cotton garment care guide, Asket manufacturer

    Clothing maker guidance to wash cotton jersey at 30 degrees or by hand for a spot treatment, to avoid the tumble dryer because cotton shrinks in it, to air dry out of direct sunlight, to shake and gently stretch a jersey garment back into shape while it is damp, and to keep bleach off coloured cotton.

    Checked 1 September 2026

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

    Manufacturer instruction to use cold water only because hot water encourages the proteins to set into the fabric, to soak in cold salted water at one or two tablespoons of salt per litre for several hours, to use an enzyme rich biological formula but not on wool or silk, and not to wash hot until the mark has gone.

    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 protein mark that plain detergent will not shift.

    Checked 1 September 2026

  4. How to remove period blood stains, Bodyform manufacturer

    Manufacturer guidance that hot water is ruled out on a period stain, that the mark is blotted rather than rubbed, that a thirty minute cold soak comes before a gentle detergent wash, that a salt and cold water paste can be left several hours or overnight, and that vinegar, lemon juice and hydrogen peroxide can strip colour from darker bedding so are tested first.

    Checked 1 September 2026