Last Updated on September 22, 2026 by Umar Farooq
Scrape off anything solid, rinse in cold running water, then soak for at least 30 minutes with an enzyme detergent. Wash cold, air dry, and repeat before the garment ever meets heat. Blood is a protein stain: heat cooks it into the fibre, and once that has happened nothing brings it back.
Everything on this page follows from that one fact, including the step where two respectable sources disagree about the water temperature.
Blood is protein, which decides everything
Whirlpool puts the mechanism in one line: “similar to other bodily fluids like sweat and urine, proteins in blood are what make it a stubborn stain“, and as it dries “the protein in blood can quickly bind to fabric fibers” (how to get blood out of sheets).
Protein does two things that matter here. It coagulates with heat — the same change you can watch in an egg white, and just as irreversible. And it is broken down by enzymes, which is why enzyme detergent is the active ingredient in this job and why plain soap only gets you part of the way.
UGA’s textile service gives the heat warning in six words: “Stains set by heat will be difficult to remove” (removing blood stains).
And here is the trap this site can add. “Wash cold” assumes your machine’s cold is actually cold. Many washers blend hot into a cold cycle, either by design or through a crossed valve, so a garment can go through a “cold” wash at a temperature well above what you intended — and the stain sets without you doing anything wrong. If your cold washes come out warm, check that before you blame the stain remover: washer filling with hot water on a cold cycle.
How to get dried blood out of clothes, step by step
- Scrape first. Whirlpool’s opening move on an old stain is to “start by scraping any dried blood off the fabric”. Anything sitting on the surface should not be dissolved back in.
- Rinse in cold running water from the back of the fabric, and rub with bar soap or liquid detergent — UGA’s first step exactly.
- Soak for 30 minutes or longer with an enzyme detergent. This is the step that does the work on a dried stain, and it is worth an hour rather than thirty minutes.
- Wash cold, with oxygen bleach if the fabric allows. That is Whirlpool’s instruction for older stains.
- Air dry and look at it in daylight. Repeat before any heat. Whirlpool: “repeat the process without drying until the stain is gone.”
Two or three rounds on an old stain is normal, not a sign the method is failing.
Where the sources disagree: cold soak or lukewarm?
This is worth showing rather than picking a side silently, because both are credible and the difference is real.
Whirlpool says cold: “soak the sheets in cold water with an enzyme laundry detergent.” UGA says lukewarm: “soak 30 minutes or longer in lukewarm water with enzyme pre-soak.”
Both are right about something. Cold protects the protein from setting. Enzymes, though, are catalysts and they work faster as temperature rises — a cold soak is a slower soak.
The resolution that fits both: cold for the initial rinse, lukewarm for the enzyme soak, and hot at no point. Lukewarm here means genuinely tepid, the temperature of a comfortable hand wash — not warm from the tap on a hot day.
If the enzyme soak is not enough
UGA’s escalation ladder, in order, with the fibre warnings attached.
- Hydrogen peroxide. “Put a few drops of 3 percent hydrogen peroxide on stain for 1-3 minutes.” Light and white fabrics only; it lifts colour as readily as it lifts blood, so spot-test.
- Ammonia. “Apply a few drops of ammonia and wash again.” Powerful on protein and the one with the sharpest limits: “Ammonia damages silk and wool. If you must use on these fibers, dilute with equal amounts of water and use sparingly.” On anything in how to wash a wool sweater, leave it alone.
- Oxygen bleach in the wash, which is gentler than chlorine and safe on more fabrics.
Never chlorine bleach on protein. It oxidises rather than digests, it does not remove the protein, and on whites the follow-up problem is its own subject (how to wash white clothes). And never mix any two of these in the same treatment.
FAQ
Can you get dried blood out of clothes?
Often yes, provided the stain has never been through heat. Cold rinse, a long enzyme soak and a cold wash, repeated two or three times, clears most of them.
Does hot water remove blood stains?
No — it does the opposite. Blood is protein and heat coagulates it into the fibre permanently.
What is the best thing to remove dried blood?
An enzyme detergent, soaked for at least half an hour. Enzymes break protein down, which no amount of plain detergent does.
Will hydrogen peroxide bleach my clothes?
It can. UGA limits it to a few drops for one to three minutes, and it is best kept to white and light fabrics after a spot test.
Can I use ammonia on a blood stain?
On sturdy fabrics, yes, a few drops. Not on silk or wool, which UGA says it damages — and if you must, dilute it half and half.
Why did the stain come back after washing?
It probably never left, and drying made what remained visible again. Inspect damp laundry in daylight before it goes near a dryer.
Dried blood is more forgiving than it looks
Cold, enzymes, patience, and no heat until it is gone. Dried blood looks like the hardest stain in the basket and is actually one of the more forgiving — as long as nobody has already washed it hot, in which case no page on the internet can help.
