Why You Should Never Clean a Crime Scene Yourself

I understand the instinct. Something terrible has happened in your home, and you want it gone. You want to scrub it away, throw open the windows, and make it look like it never happened.

Every week, someone calls us after they’ve already tried. They’ve spent hours on their hands and knees with bleach and hot water. The visible stains are gone, maybe. But the property isn’t clean. Not really. And now they feel worse than they did before they started.

Please. Don’t do this to yourself.

Here’s why, and I’ll be straight with you.

Biohazard Risks: What You Can’t See Can Hurt You

Blood and bodily fluids are classified as biohazardous material. That’s not jargon. It means they can carry infections that will make you seriously ill.

Hepatitis B is the big one. The virus survives on dried surfaces for up to 7 days at room temperature. Seven days. You could be cleaning a surface that looks dry and harmless, and the virus is still active. HepB is 50 to 100 times more infectious than HIV. One splash to a cut on your hand, a crack in your skin, or your eyes, and you’re exposed.

Hepatitis C can survive outside the body for up to 6 weeks in the right conditions. Weeks, not days. It’s harder to catch than HepB through surface contact, but the risk is real, particularly with needlestick-type injuries from contaminated sharp objects hidden in the scene.

HIV is less resilient on surfaces. It typically becomes inactive within hours once exposed to air. But in pooled blood or in protected environments, like soaked into carpet underlay or between floorboards, it can persist longer. The science isn’t absolute. That uncertainty is exactly why you don’t take the risk.

Other pathogens present in biological material include MRSA, E. coli, and various bacterial infections. A crime scene isn’t a controlled environment. You don’t know what you’re dealing with.

The PPE we wear isn’t for show. Full Tyvek suits. Respirators with P3 filters. Double-layer nitrile gloves. Sealed boot covers. Face shields. We treat every scene as high-risk because that’s the only responsible approach.

Marigold gloves and a face mask from Screwfix won’t protect you. They just won’t.

Legal Issues: Waste Disposal

This one catches people by surprise. You can’t just put biohazardous waste in your wheelie bin.

Under UK law, biological waste from a crime scene is classified as hazardous waste. Specifically, it falls under the European Waste Catalogue codes for clinical and biological waste. Disposing of it incorrectly is an offence under the Environmental Protection Act 1990 and the Hazardous Waste Regulations 2005.

What does that mean in practice?

• Contaminated carpet, underlay, and soft furnishings need to go through a licensed clinical waste contractor
• You need a waste transfer note documenting what was removed and where it went
• The waste must be transported by a registered waste carrier
• It must be processed at a licensed treatment facility

You can’t take blood-soaked carpet to the tip on Hartcliffe Way. You can’t put it out with the recycling. And if Bristol City Council’s environmental health team finds out you’ve put biohazardous material in household waste, you could face a fine.

We hold the correct waste carrier licences and work with licensed disposal facilities. Every item removed from a scene comes with a full paper trail.

The Psychological Impact

This is the part nobody talks about enough. And honestly, it’s the reason I wish more people would call us before they try to do it themselves.

Cleaning up after a traumatic event in your own home is psychologically damaging. Full stop.

The people who call us after attempting it themselves don’t talk about the stains. They talk about the smell. The texture. The moment they realised what they were touching. These are experiences that stay with people. They become part of the trauma, layered on top of whatever already happened.

I’ve spoken to grief counsellors who’ve told me the same thing. The act of cleaning up a loved one’s blood, or the aftermath of a violent event, can cause or worsen post-traumatic stress. It creates sensory memories that are incredibly difficult to process.

You wouldn’t be expected to perform surgery on a family member. You shouldn’t be expected to do this either.

Our teams are trained for this work. Not just technically. Psychologically. They’re prepared for what they’ll see. They process it through proper support structures. They chose this work knowing what it involves.

You didn’t choose this. Let someone who did handle it.

We also provide trauma cleaning services for situations beyond crime scenes, including unattended deaths, accidents, and other distressing events.

Why the Result Won’t Be Adequate

Even setting aside the health risks, the legal issues, and the emotional toll, there’s a practical problem: a DIY clean won’t actually work.

Bleach reacts with blood. Most people reach for bleach first. It’s the wrong choice. Bleach reacts with the proteins in blood, creating toxic chloramine gas. In an enclosed space like a bathroom, that’s dangerous. And it doesn’t break down the biological material properly. It just changes the colour. The contamination is still there.

Hot water sets blood. Another common mistake. Hot water causes blood proteins to coagulate and bond to the surface. It’s the same reason you rinse a blood stain in cold water on clothing. Use hot water on a blood-contaminated carpet, and you’ve just made it permanently worse.

Surface cleaning misses subsurface contamination. Blood soaks through. Through carpet, through underlay, into the floorboards, into the subfloor. A litre of blood can spread across several square metres of subfloor. You might clean the carpet and think the job’s done. Underneath, it’s still contaminated. Two weeks later, the smell starts.

You can’t verify your own work. We use UV light inspection and ATP testing to confirm a surface is clean at a biological level. Without that verification, you’re guessing. And guessing with biohazardous material isn’t good enough. We’ve covered the full technical detail in our blood cleanup specialist guide.

Cross-contamination. Without proper protocols, it’s easy to spread contamination rather than remove it. Walking through a contaminated area and then into the kitchen. Using the same cloth in two rooms. Rinsing contaminated materials in the household sink. Each one creates a new contamination zone.

I’ve attended properties where someone’s cleaned the obvious area but unknowingly tracked contamination into the hallway, the bathroom, and the kitchen. We ended up treating three times the original area.

What to Do Instead

Don’t touch it. Don’t enter the affected area if you can avoid it.

Call us.

07985 505061 during working hours. 0808 303 7072 for emergencies, 24/7.

We’ll be there within hours. Unmarked vehicles. Full PPE. Proper equipment. Twenty-five years of experience.

If you’re worried about the cost, read our guide on who pays for crime scene cleaning in the UK. Insurance covers it more often than people think, and we offer payment plans when it doesn’t.

Bristol Cleaning Heroes. 290-294 Southmead Road, BS10 5EN. £2 million insured.

Email hello@bristolcleaningheroes.co.uk if you’d rather not call.

You don’t have to do this. That’s why we exist.