A nosebleed in the small hours, a cut, a period that arrives early. Blood on the bed is one of the most frequent stains in any accommodation, and it is almost never a sheet problem: sheets get washed. The problem is what lies underneath. If the blood has reached the mattress, you are treating something that cannot go in the washing machine, that has foam or springs inside, and that takes days to dry once it is wet. This guide is the protocol for that case, with a source for each step, and the part that saves you from ever needing it.
First, what is under the sheet
A mattress is not a piece of fabric. On the outside it has the ticking, the outer cloth, often quilted over a layer of fibre or foam. Beneath that are the comfort layers, foam, latex or memory foam, and in the centre the core, springs or foam. Nearly all of it is porous: a liquid that gets through the ticking spreads inwards and sideways, and what stays inside cannot be rinsed out.
That gives the two rules behind everything that follows. First, you work on the surface with as little liquid as possible, because every drop you add to clean is one more drop to dry. Second, a damp mattress is worse than a mattress with a faint mark. The US CDC's infection-control guidelines for healthcare facilities (Guidelines for Environmental Infection Control in Health-Care Facilities, 2003) put it plainly: a wet mattress "can be a substantial environmental source of microorganisms". And the Spanish mattress maker Pikolin attributes mould spots on a mattress to moisture, a cold room and a lack of air circulation.
Why cold water, and why not for ever
The advice to use cold water on blood is universal, and it has a basis. Haemoglobin is a protein, and heat denatures it: it changes shape and grips the fibre. The blood-stain guide from the University of Georgia's extension service (UGA Cooperative Extension) sums it up in two sentences: always use cool water on blood, and treat it as soon as possible, because a set blood stain is extremely difficult to remove.
What it does not mean is that hot water always cleans worse. A study published in 2020 in PLoS One (Oya and colleagues, "Kinetic analysis of hemoglobin detergency") measured how much haemoglobin is removed from cotton at different temperatures and found that washing efficiency rises with temperature, although at 65 °C it improves less than expected, because the temperature is approaching the point where the protein denatures. The practical reading is this: fresh blood comes out cold, while it is still soluble; once it is out, the sheet goes to its normal wash at its usual temperature. Heat too early is what sets the stain, not the wash that follows.
Sheets and protector: the easy part
Put gloves on. Another person's blood is always treated as potentially infectious, and the same CDC guideline recommends handling contaminated linen with as little agitation as possible and bagging it where it is removed. In practice: fold it in on itself, without shaking, and bag it separately.
- Sheets and pillowcases: rinse cold from the back, under the tap, rubbing in a little soap or liquid detergent, as UGA advises. If a mark remains, soak in cool water for 30 minutes or more, then another 30 in lukewarm water with an enzyme pre-soak. Then its usual programme. The rule we use for make-up applies here too: no tumble dryer until the stain has gone, because whatever goes through the dryer with a shadow keeps it. The full pre-treatment protocol is in the guide to make-up stains on sheets.
- Mattress protector: into the wash as soon as possible, ideally while the stain is still wet. That is the instruction Tempur-Pedic gives in the warranty for its own protector: machine-wash it immediately after any spill. Follow the label for temperature and drying. The waterproof membrane is the delicate part of a protector, and on ours the care sheet is clear: machine wash according to composition, and no bleach.
Then lift the protector and look
It is the step almost nobody takes and the only one that tells you whether there is a problem. The US FDA, in its guidance on hospital mattress covers (updated in 2017), asks staff to remove the cover regularly, check its inside surface and inspect the mattress for stains, wet spots or damage, on every side. The reason it gives is concrete: between 2011 and 2016 it received more than 700 reports of covers that failed to stop blood or body fluids reaching the inside of the mattress; the FDA explains that, over time, covers wear out and let fluids through.
If the mattress is clean and dry, the protector has done its job and there is nothing more to do. If there is a stain, two conclusions at once: the mattress needs treating today, and the protector has failed. Hold it up to the light. A pinhole, a cut or a cracked area of membrane takes it out of circulation; the FDA says to replace at once any cover with visible stains, damage or wear.
The blood has reached the mattress: the protocol
- Act the same day. Every hour that passes, the blood dries into the ticking and the odds of a permanent shadow go up.
- Blot, do not rub. With a white cloth dampened in cold water, dabbing from the outside in so the ring does not grow. Turn the cloth as it takes up colour. Rubbing spreads the stain and pushes it towards the foam.
- A mild solution, in small amounts. For upholstery in natural fibres, UGA suggests a quart of cool water, roughly a litre, with half a teaspoon of washing-up liquid or liquid detergent; its formula also adds a tablespoon of ammonia, which we leave out here because it damages wool, as you will see below. Apply it with the cloth; do not pour it. Where protein remains, an enzyme cleaner used sparingly does the same job as the pre-soak on a sheet.
- For the shadow, 3 % hydrogen peroxide, and only if the label allows it. UGA gives a few drops on the stain for one to three minutes, then a rinse. On a mattress, the rinse is dabbing with a damp cloth. Hydrogen peroxide is a bleach: test it first on a corner that does not show, do not use it on coloured ticking, and respect what the manufacturer says. Tempur-Pedic, for example, rules out chlorine products and harsh stain removers on its mattress covers.
- Take out all the water you can. Tempur-Pedic describes it well: press dry towels onto the area until they stop coming away damp. This is the step that counts most.
- Dry it completely before making the bed. A fan over the area, the window open, and the room off sale until the mattress is dry to the touch, inside as well. A protector and sheets over a damp mattress trap the moisture exactly where mould needs it.
If the mattress has a zipped cover, which is different from a protector because it encases the whole mattress, check the label: many come off and can be washed. For its own, Tempur-Pedic specifies cold water, mild detergent, no bleach and air drying.
What not to do
- Hot water or steam. They set the protein and drive moisture into the core. Steam-cleaning a mattress with fresh blood on it is exactly the mistake.
- Soaking. The maker of Tempur memory foam says it outright: its material should never become wet.
- Bleach. Not on the protector, not on the mattress. And never mix bleach with ammonia, which UGA uses in some upholstery formulas: together they release chloramines, a toxic gas.
- Ammonia on wool or silk. Some ticking has wool in the quilting. UGA warns that ammonia damages wool and silk.
- Scrubbing with a stiff brush. It roughens the ticking and enlarges the ring.
When the mattress does not go back on a bed
Let us be clear about what can be achieved. A stain treated in time almost always comes out of the ticking, or is left as a very faint shadow. Whatever has reached the inside cannot be rinsed out. For a hospital, the CDC guideline leaves no room: a visibly stained mattress is replaced. An accommodation is not bound by that standard, but it does have to ask itself two questions. If a guest lifted the sheet, would they see a stain? And if that mattress has a warranty, does it still?
The second question has a written answer. The ten-year warranty on Tempur-Pedic mattresses expressly excludes stains and liquid damage, bodily fluids included, and the maker reserves the right to void it if it finds the mattress in an unsanitary condition. It is a common clause in the trade, and it is worth reading the one on your own mattresses before you need to.
The protector is the piece that makes all of the above unnecessary
This whole protocol exists because a mattress cannot be washed. A protector can, and that is its entire reason for being. Three things decide whether it does its job:
- It must be genuinely waterproof. A quilted mattress pad without a membrane protects against rubbing and dirt, but lets a liquid through. What stops blood is the membrane: polyurethane, which is waterproof and breathable and not felt when sleeping, or PVC, equally waterproof but less breathable.
- It must have a spare. If the stained protector goes to the laundry and there is no other, the bed is out of service or, worse, is made up without one. That is why it is counted at 1.25 PAR, one per bed and one spare for every four, as the PAR guide explains.
- It must be checked. A protector with a punctured membrane is just another sheet. Hold it to the light at every wash, and retire it at the first pinhole. The retirement signs for the rest of your linen are in the renewal guide.
If you are looking for one with a polyurethane membrane, our waterproof mattress protector is an example of the specification worth asking for: terry composition, membrane type, fit and sizes by mattress. And for what goes into the machine after a night like that, the washing guide has the temperatures and chemistry for each item.