How to Remove Blood From Carpet, Fresh or Dried

How to remove blood from carpet

1
Blot, don't rub
Press a dry white cloth or paper towel onto fresh blood and lift straight up. Keep switching to a clean area until nothing more comes up. For dried blood, gently scrape off any crust with a spoon and vacuum the flakes.

Why: Blotting removes blood that hasn't bonded to the fibers. Rubbing spreads it and frays the yarn tips into a fuzzy patch.
2
Blot with cold water
Mist the spot lightly with cold water and blot again. Repeat while the cloth keeps picking up color.

Why: Cold water dissolves blood proteins that haven't set yet. Warm or hot water starts to cook them onto the fibers.
3
Apply a weak dish-soap solution
Mix 1/4 teaspoon of clear dish soap into 1 cup of lukewarm water. Dampen a white cloth with it and dab from the outer edge of the stain toward the center. Let it sit a few minutes, then blot.

Why: This is the Carpet and Rug Institute's first step for blood. The surfactant loosens blood from the pile, and working inward stops the ring from growing.
4
Rinse with cold water and blot
Mist with cold water and blot, two or three times, until the area no longer feels soapy.

Why: Soap left in the pile stays sticky and attracts dirt, so the spot would come back darker.
5
Try a dilute ammonia solution if a mark remains
On synthetic carpet only, mix 1 tablespoon of household ammonia into 1 cup of water, test it in a hidden spot, then dab it on with a cloth, blot, and rinse with cold water.

Why: A mild alkali helps loosen dried protein. It's the Carpet and Rug Institute's next step for blood, but it can affect some dyes, and alkalis damage wool.
6
Weight it dry
Lay a thick pad of white paper towels on the spot and put a heavy book on top. Change the pad as it soaks up moisture, then brush the pile upright once dry.

Why: Pulling moisture up and out stops leftover blood in the base from wicking back to the surface as the carpet dries.

Why blood is harder on carpet than on clothes

Blood is mostly water carrying proteins, and as it dries those proteins clot and cling to fibers. Heat denatures them so they harden in place, which is why hot water, steam and irons set a protein stain. On clothes you can flush from the back and soak; on carpet you can't, because the pile is anchored in a backing over a pad.

That changes the method. Every liquid goes on with a cloth, in small amounts, and comes off by blotting. Too much water carries blood down into the backing and pad, where it can wick back up as the surface dries. The red-brown color is heme, the iron-containing part of hemoglobin, and it can stay after the protein is gone; on carpet, that's when dilute ammonia, peroxide or a professional comes in.

By situation

Dried blood on carpet

Scrape off and vacuum any crust first. Then rehydrate the stain by leaving a cloth dampened with the cold dish-soap solution on it for several minutes before blotting. Expect to repeat the soap, rinse and blot cycle several times, then move on to the ammonia step.

Period blood on carpet

It's the same chemistry as any blood, so use the same cold-water method. Act as soon as you see it, and wear gloves if it isn't your own blood.

A large spill or one that soaked through

If blood reached the pad, surface blotting won't get it all, and the stain will keep coming back. A professional with extraction equipment can flush and pull it out of the backing.

Light-colored or wool carpet

On wool, skip ammonia: wool is a protein fiber that alkalis damage. Call a professional for anything beyond the cold-water and dish-soap steps. On light synthetic carpet, test peroxide carefully before using it.

Blood on an area rug

Slip a towel under the rug to protect the floor, then use the same blotting method. A small washable rug can be rinsed from the back under cold water and laundered per its label.

What not to do

Don't use hot water, a steam cleaner or an iron. Heat coagulates blood proteins in the pile and can make the stain permanent.
Don't pour water or cleaner onto the spot. Too much liquid soaks the backing and pad, and the stain wicks back up as it dries.
Don't use laundry or dishwasher detergent. Laundry detergent can carry brighteners that dye carpet fibers, and dishwasher detergent can contain bleach that strips carpet dyes.
Don't mix ammonia with bleach. Together they release toxic chloramine gas. Never mix them, and rinse well between products.

Other methods that work

3% hydrogen peroxide

For a stubborn mark on synthetic carpet, dab a little 3% hydrogen peroxide on with a cloth after testing, let it fizz, then blot and rinse with cold water.

Caution: It can lighten carpet dye, so always test in a hidden spot first and use it sparingly.

Enzyme cleaner

An enzyme spot cleaner made for carpet breaks down protein the same way enzyme laundry products do. Follow the label's dwell time and blot.

Caution: Test for colorfastness first, and rinse and blot well afterward.

Salt paste

Salt pastes and salt water are traditional remedies for dried blood, with weak evidence. They come from older laundry guidance, not carpet guidance.

Caution: Rinse and blot thoroughly so no salt residue is left in the pile.

Stain still there?

The stain came back after the carpet dried

Blood in the base wicked up. Re-treat lightly with the soap solution, rinse, and weight-dry with a thick pad so moisture moves up into the towels.

A brown or rusty shadow remains

That's the heme pigment. Try the ammonia step or a tested dab of 3% hydrogen peroxide on synthetic carpet. If it doesn't change, call a professional.

The spot is now lighter than the rest of the carpet

A cleaner lifted some dye or the area is cleaner than its surroundings. Stop treating it. A professional cleaning of the whole area can even out the difference.

Safety

Wear disposable gloves when cleaning up someone else's blood.
Use ammonia with the window open and never combine it with bleach.
Test every solution in a hidden spot first.

Never mix cleaning products; see chemicals you must never combine.

Questions

What's the best way to get blood out of carpet?

Blot with cold water, then a solution of 1/4 teaspoon dish soap per cup of water from the edges in, and rinse with cold water. Use a dilute ammonia solution next if needed, and call a professional for anything that remains.

How do you get dried blood out of carpet?

Scrape and vacuum the crust, let a cloth with cold dish-soap solution rest on the stain for several minutes, then blot and rinse. Repeat several times before trying ammonia or peroxide.

Does hydrogen peroxide remove blood from carpet?

It can help on synthetic carpet, but it may lighten the dye. Test it in a hidden spot and use only the 3% strength.

Can you use a carpet steam cleaner on blood?

Not on the stain itself. Heat sets blood proteins. Remove the blood with cold water first; steam or hot-water extraction is only safe once the stain is gone.

Does salt get blood out of carpet?

It's a traditional remedy with weak evidence. The Carpet and Rug Institute's method uses dish soap, cold water and dilute ammonia instead.

Blood on other surfaces

Other stains on carpet

Sources

Spot Solver: Blood, The Carpet and Rug Institute
Carpet Stains 4-1-1: Best Practices for Removing Stains, The Carpet and Rug Institute
Spot Solver: Feces (general spot-removal steps and solution recipes), The Carpet and Rug Institute
Stain Removal for Washable Fabrics (HE 2-840), University of Kentucky Cooperative Extension Service
Understand Your Fibers, University of Georgia Cooperative Extension
Chlorine gas: What happens if you mix bleach and other cleaners, National Capital Poison Center (Poison Control)

Last updated October 26, 2026. Methods are drawn from the sources above; how we research and check our guides.