How to remove a blood stain from carpet

Why blood behaves differently to other stains

Blood is a protein stain. Proteins change structure when they are heated, which is what happens when an egg is cooked. Once that happens in a carpet fibre, the stain is bound in place and far harder to shift. That single fact explains almost every rule below: keep everything cold, keep it gentle, and use products designed for protein rather than general-purpose sprays.

Step by step for a fresh stain

Work calmly and in this order. Test anything other than plain water on a hidden corner first.

• Blot, do not rub, with a clean white cloth or kitchen roll to lift as much as possible
• Apply a small amount of cold water and blot again, working from the edge towards the centre
• Repeat until the cloth stops picking up colour
• If colour remains, use a small amount of a mild, colourless washing-up liquid in cold water, then blot
• Rinse with a little cold water and blot dry so no detergent residue is left to attract dirt
• Place a folded dry towel on the area with light weight on top to draw out remaining moisture

Dried or older blood stains

A stain that has dried can often still be improved. Rehydrate it gently with cold water, give it time to soften, then blot as above. Enzyme-based stain removers designed for protein stains can help on dried marks, but read the label and test first, especially on wool, which some products can damage. Several gentle rounds work better than one aggressive one.

What not to do

Most permanent blood stains are caused by the first attempt at removal, not the blood itself.

• No hot water, hairdryers or steam cleaners until the stain is completely gone
• No scrubbing with a brush, which pushes blood deeper and distorts the pile
• No bleach or strong oxidisers on coloured carpet, which can strip the dye permanently
• No over-wetting, which lets the stain wick down into the backing and back up later

When to call a professional

Call in a carpet cleaner if the stain is large, has soaked into the underlay, is on a delicate or wool carpet, or keeps reappearing as it dries. That last sign, called wicking, means residue is still in the backing. A professional clean uses controlled moisture and extraction to flush the stain out without flooding the carpet, with a spotting chemistry chosen for protein stains. If a carpet has been heavily contaminated, cleaning may not be enough and replacement of that section is the honest recommendation.

Hygiene considerations

Blood can carry infection. Wear disposable gloves while cleaning, keep children and pets away from the area until it is dealt with, and bag used cloths before putting them in the bin. On commercial premises, follow your own workplace procedure for body fluid spills before any carpet cleaning takes place.