First few minutes
Just happened? Do this first
- Act fast: fresh blood lifts far more easily than blood that has been there over 24 hours.
- Blot with a clean, dry white cloth or paper towel. Don't rub, which spreads the stain.
- Pretest any cleaner on a hidden spot first, and stop if color transfers or changes.
Blood on grout is easiest to lift before it dries into the lines, since it's a protein stain. Whether the grout is cement or epoxy changes what's realistic: a stain in cement grout can become part of it, while epoxy usually cleans back closer to its original color. Fresh spots lift faster, and dried blood may need several rounds before the lines match the rest.
If the stain is in a shower, go slow with the first cleaner and watch how the lines respond. Dried lines in tile grout usually respond best to a paste made from baking soda. Stop scrubbing if the grout starts to look rough, because that's damage you can't undo.
Before you start
What grout can take
Safe to use4
- Water
- Hot water
- Enzyme cleaners
- Heat, once the stain is out
Use with care5
- Soaking
- Chlorine bleach
- Solvents (alcohol, spot removers)
- Acids (vinegar, lemon)
- Scrubbing and abrasives
6 items
What you'll need
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- Clean dry white cloth or white paper towelsLifts the blood without transferring color. (opens Amazon)
- SpongeFor wiping with cool water. (opens Amazon)
- Soft nylon toothbrush or white nylon padNylon is the recommended tool for grout. (opens Amazon)
- Baking soda or a powdered cleanserA gentle scrub for what the water leaves behind. (opens Amazon)
- Enzyme presoakFor dried or old blood in the set-in treatment.
- 3% hydrogen peroxideBleaches leftover blood after the enzyme soak. (opens Amazon)
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5 steps
Step by step
Step 1 of 5
Blot up the wet blood
Press a clean, dry white cloth or white paper towel onto the stain and lift. Switch to a clean part of the cloth each time it picks up color, until it stops picking up color.
Step 2 of 5
Wipe with a cool, damp sponge
Wring a sponge out in cool water and wipe the stain from the outside edge toward the middle. Rinse the sponge often so you lift blood off the grout instead of spreading it around.
Careful. Hot water sets blood, so keep the first wipe cool.
Step 3 of 5
Scrub with baking soda or powder
If any stain remains, dip a wet toothbrush into a little baking soda or powdered cleanser. Scrub the grout carefully along the joint, keeping the brush wet so the paste stays soft.
Careful. Use a soft nylon brush or white nylon pad, the recommended tools for grout.
Step 4 of 5
Rinse and dry the grout
Rinse thoroughly with clean water until no cleaner or grit is left in the joints, then dry the area with a towel. Check the grout in good light before deciding on anything else.
Tip. A flashlight held at an angle shows faint shadows better than overhead light.
Step 5 of 5
Repeat only if a shadow remains
If a faint shadow still shows, repeat the cool wipe and the gentle scrub once. Stop when the grout matches the grout beside it, and move on to the set-in treatment only if the stain is still there.
If you'd rather buy than mix
Best products for blood on grout
Look for an enzyme presoak made for protein stains, and a soft nylon brush for the scrub. Skip any grout cleaner that is acid-based.
Amazon Basics Microfiber Cleaning Cloths
How we picked these: each product is made for this type of stain, its maker doesn't warn against using it on grout, and its directions fit the steps above.
Finished the steps? How does it look?
Nice work. Let it dry completely and check it again in good light. Here is what done looks like:
How to tell it's really gone →A faint mark usually needs one more round, not a stronger product.
If the stain was already dried or set, the method changes.
Old, dried or set-in stains →When to call a professional →How to tell it's working
The grout is clean when the spot blends into the grout around it and no color comes off on the cloth. If the spot looks dull or feels slick, cleaner is still in the grout, so rinse again with plain water.
What changes for yours
Adjust for your grout
Grout in a shower
Shower grout carries soap film and constant water, so the rinse matters more here than anywhere else. After the scrub, rinse the joints until they squeak under a fingertip, then let them dry fully before you judge the stain.
If your shower grout is sealed, strong or acidic cleaners reduce how well that sealer repels stains, so keep to the baking soda and enzyme steps. If the stain has spread onto the tub surface, the Bathtubs guide covers that material.
Epoxy grout
Epoxy grout can be cleaned back to its original color, which makes it the easier of the two to rescue. It is the only grout here where a bleaching cleanser is an option for tough soil, and only after the water and baking soda steps have failed.
Use the same gentle scrub and rinse, and check the color after each round before going further.
Cement grout
Cement grout is alkaline, and acid etches it, so vinegar and other acids stay off it. A stain can become part of the grout itself, so an old mark may leave a faint shadow even after a full cleaning.
Stick to cool water, baking soda and the enzyme presoak, and skip bleach-containing cleaners on sealed grout. Strong cleaners also reduce how well a sealer repels stains.
Glazed tile next to grout
Glazed tile can dull under strong acid, and acid also makes the grout lose color or turn powdery. When you scrub near the tile edge, keep to water and baking soda.
If a little cleaner lands on the tile, rinse it off with plain water so nothing dulls the glaze.
Natural stone tile
Marble, limestone and travertine are calcareous stone, and granite is siliceous, so vinegar and other acids should stay off all of them. Use the same cool water wipe and baking soda scrub, and keep the nylon brush soft.
Rinse thoroughly and dry, since any leftover cleaner can leave a film.
Old, dried or set-in stains
Old blood that has sat in grout for a day or more needs longer than a wipe. Mix an enzyme presoak in warm water, not hot, then dampen a pad and hold it on the stain for at least 30 minutes, or soak for several hours if the stain is aged.
Once the enzyme has worked, scrub gently with a nylon brush and rinse well. If a shadow of blood remains, dab 3% hydrogen peroxide on with a dropper and rinse it off.
Blood that has dried into cement grout becomes part of the grout, so it may never fully lift. Epoxy grout can be cleaned back to its original color. On epoxy grout only, a bleaching cleanser is the last resort for tough soil, used after the enzyme and peroxide steps and rinsed out well.
Vinegar, baking soda, peroxide and more
Do home remedies work on blood on grout?
Many home remedies for blood don't belong on grout, and a few can damage it. Here is where each common one stands for this stain.
Works1Helps1Skip3Avoid1
What makes it worse
Mistakes to avoid
Don't leave cleaner to dry on grout
Cleaner that dries on the grout leaves a film, and even a good alkaline cleaner leaves a sticky soap film if you don't rinse it. Rinse with plain water until the grout feels clean rather than slick.
Don't use oil or wax cleaners
They leave a film in the grout that is hard to rinse out. Water, baking soda and the enzyme presoak are enough for this stain.
Don't mix bleach with ammonia or acids
Chlorine bleach mixed with ammonia gives off toxic fumes, and it shouldn't meet vinegar or rubbing alcohol either. If you do use bleach, rinse everything else out with plain water first and ventilate the room.
When to call a professional
Deep stains that survive the set-in treatments are worth a professional's look. Acid cleaning needs real care, so leave that job to a pro.
Questions
Can old blood come out of grout?
Often, but not always. Old blood needs the enzyme presoak and may need several rounds, and cement grout can keep a faint shadow. Start with cool water and baking soda before moving to the presoak.
Does hydrogen peroxide work on grout?
Yes, the 3% drugstore strength can bleach out leftover blood after an enzyme soak. Apply it with a dropper and rinse it off well.
Can I use bleach on grout?
Only as a last resort, and only on epoxy grout. Bleach-containing cleaners are not recommended on sealed cement grout, so skip it there.
How long should the enzyme presoak sit?
At least 30 minutes with a damp pad held on the stain. For aged stains, a soak of several hours is the better choice.
What if I used hot water by mistake?
Switch to cool water right away and don't repeat the hot wipe. The heat may have set the stain a little more, so the enzyme presoak is the next step.
Is chlorine cleaner safe near stainless fixtures?
Keep chlorine cleansers off stainless partitions and fixtures, since the chlorine can damage the finish. Use the baking soda scrub on the grout and rinse well so no residue reaches the metal.
Blood on other materials
Other stains on grout
Start from the bigger picture
How we know this
Every method, amount and warning here comes from university extension services, industry bodies and product makers. We read them, check every step for unsafe combinations and changed amounts, and write it up so you can follow it.