To clean blood from a floor, start by wiping up as much as possible with cool water and a cloth, then disinfect the area with a diluted bleach solution. The process changes slightly depending on whether the blood is fresh or dried and what type of flooring you have, but the core steps are the same: protect yourself, clean the visible stain, disinfect, and dispose of materials safely.
Protect Yourself First
Blood can carry infectious agents that survive on hard surfaces far longer than most people expect. Hepatitis B can persist on stainless steel for over 14 days. Hepatitis C survives on plastic surfaces for up to six weeks at room temperature. Even HIV can remain viable on glass for five days. You don’t need to panic, but you do need to take basic precautions, especially if the blood isn’t yours.
At minimum, wear disposable gloves (latex or nitrile), eye protection like goggles or a face shield, and a face mask. If you’re dealing with a larger spill, wear clothing that covers your arms and legs, or put on a disposable coverall. Avoid touching your face during cleanup, and wash your hands thoroughly with soap and warm water after removing your gloves.
Cleaning Fresh Blood
Fresh blood is much easier to remove than dried blood. Use cool water, not warm or hot. Heat causes the proteins in blood to coagulate and bind to surfaces, making the stain harder to lift. Dampen a cloth or sponge with cool water and wipe up as much blood as possible, working from the outside of the spill inward to avoid spreading it.
For tile, concrete, brick, or stone floors, follow up by scrubbing the area with a solution of laundry detergent in warm water. Rinse well and let the surface dry. For resilient flooring like vinyl or linoleum, wipe with cool water or warm sudsy water first, then dry with a clean cloth. If any stain remains, you can move on to a bleach solution (more on that below).
Marble requires a gentler approach. Wipe with a sponge dipped in cold water. If staining persists, make a thick paste from water, powdered detergent, and hydrogen peroxide. Spread it over the stain, cover it with a damp cloth to keep the paste from drying out, and leave it until the stain has lifted. Rinse thoroughly afterward.
Removing Dried Blood
Dried blood bonds to surfaces and needs to be rehydrated before you can clean it effectively. Lay a cloth or paper towels soaked in cool water over the stain and let them sit for 10 to 15 minutes. This softens the dried blood so it releases from the floor without requiring aggressive scrubbing, which can scratch certain surfaces and, more importantly, send tiny particles airborne.
Once the blood has softened, wipe it away with the damp cloth. For stubborn spots on tile, concrete, or stone, scrub with a brush using a warm water and laundry detergent mix. Hydrogen peroxide works well on dried blood stains that resist detergent, particularly on lighter-colored grout or marble. Apply it directly, let it fizz for a few minutes, then wipe clean. On hardwood, use as little liquid as possible and dry the area quickly to prevent water damage.
Disinfecting the Area
Cleaning removes the visible blood. Disinfecting kills whatever pathogens may be left behind. These are two separate steps, and skipping the second one leaves the surface potentially contaminated even if it looks clean.
The CDC recommends a bleach solution of 5 tablespoons (one-third cup) of household bleach per gallon of room temperature water, or 4 teaspoons per quart for smaller batches. Apply the solution to the entire area where blood was present. The surface needs to stay visibly wet for at least one minute. This contact time is what actually kills bloodborne pathogens. After one minute, wipe the surface clean with fresh water and dry it.
A few important notes: never mix bleach with ammonia or other cleaning products, as this creates toxic fumes. Use the bleach solution in a ventilated room. On hardwood or marble, bleach can cause discoloration, so hydrogen peroxide (3% concentration, the kind sold in pharmacies) is a safer disinfecting alternative for those surfaces. It won’t be as broadly effective as bleach, but it does break down organic material and has antimicrobial properties.
Dealing With Grout
Grout is porous, which means blood can seep into it and resist surface-level cleaning. After wiping the area, apply a paste of oxygen-based cleaner (like OxiClean) mixed with warm water directly onto the grout lines. Let it sit for five to ten minutes so it can penetrate and lift the stain from within the pores. Scrub with a stiff brush, then rinse. Follow up with your bleach disinfecting solution. For grout that’s deeply stained, you may need to repeat this process.
Disposing of Cleanup Materials
Everything that touched the blood (gloves, cloths, paper towels, sponges) should be sealed in a plastic bag before going into the trash. Double-bagging adds an extra layer of protection. If materials are saturated enough that they would release liquid when compressed, they technically meet the definition of regulated waste under federal standards and should be handled more carefully. For a typical household spill, though, sealed bags in your regular trash are sufficient.
If you used reusable cloths, wash them separately in hot water with detergent and a small amount of bleach. Don’t mix them with your regular laundry.
When to Call a Professional
Small spills from a cut finger or nosebleed are straightforward to handle yourself. Larger situations, such as those involving significant pooling, blood that has soaked into subflooring, or scenes involving trauma, are a different matter. Professional biohazard cleanup companies carry specialized training, equipment, and permits to handle these situations safely. Some states, including California and Florida, require specific licenses for biohazard remediation, which reflects just how regulated the work is.
If blood has seeped beneath tile, into carpet padding, or between hardwood planks, surface cleaning alone won’t reach the contamination. Professionals can remove and replace affected materials and verify that disinfection is complete. This is especially relevant if the blood comes from someone whose health status you don’t know.