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Quick answer: clear out rubbish and spoiled items first, deep clean every hard surface with a proper disinfectant, treat mould and biological stains with enzyme cleaners, then finish with odour absorbers such as baking soda or activated charcoal while a dehumidifier and air purifier run in the background. Masking the smell never works, since it comes back within days if the source is still there. No two hoarder's homes look the same, so the order can shift from property to property. Below is the full hoarder's house deep cleaning process and cleaning tips we use on real jobs, because a bad case rarely responds to anything quick.
Most people assume the smell in a hoarder's house comes from clutter itself. It doesn't. Clutter hides the actual sources: rotting food, damp fabric, pet waste, and mould growing somewhere nobody has checked in years. The scale of a hoarded property can feel overwhelming at first, which is why breaking the job into stages helps. A hoarder's house often has more than one odour source running at once, which is why a single quick clean rarely fixes it.
England's local authorities collected close to 21.9 million tonnes of household waste in 2024, around 12.3 million tonnes of it residual waste, the kind most likely to rot and smell if left inside a property for weeks. In a hoarded home, waste piles up faster than it can be cleared, so old food and general rubbish are usually the strongest odour source before anything else is touched. A quick walk through helps determine which rooms need attention first. This is also where most cleaning services start, since nothing else can happen until the rubbish is out. Bacteria builds up fastest in kitchens and bathrooms, so prioritise those rooms early.
England's recycling rate was 43.8% in 2024, meaning over half of household waste isn't recycled. Sorting recyclable material away from contaminated waste is one of the first practical jobs in any clean-up.
The 2024 to 2025 English Housing Survey found around 142,000 households living with the most serious category of damp and mould problems, and private rented homes were more likely to have these hazards than owner-occupied ones. Homes struggling to stay heated were about five times more likely to develop serious damp. That link between cold, damp and mould matters, because mould produces a musty smell that lingers long after the clutter has gone. Damp fabric and cardboard left too long often develops mildew too, which needs treating on its own. Some people call it mould, others mould, but either way it needs treating at the source, not sprayed over. If you're wondering how to get rid of black mould, the first step is always to address the underlying moisture problem rather than simply cleaning the surface.
The UK has tightened its approach through measures such as Awaab's Law, part of a wider shift toward fixing damp at the source rather than masking the smell. Before moving anything, it's worth checking for potential hazards, since not every risk is present or obvious at first glance: signs of pest activity, damaged flooring, or exposed wiring. Safety comes first at every stage, from the initial sort through to the final deep clean, including basic steps like opening windows before disturbing dust.
You can't deodorise around a full room. Sorting items first is the only way to get anywhere, since fabric and soft furnishings soak up smell and hold onto it. Getting rid of rubbish before you clean is the right approach, since scrubbing around bin bags wastes time.
Work through the space in categories:
Clearing a severely cluttered room is a heavy task, so don't expect to finish in an afternoon. Not everything is stuff to throw away though; some just needs sorting properly. Sorting belongings by category, not just by room, speeds things up, and keeping a dedicated trash pile separate from the donate pile stops the two mixing back together. Bags filled with rubbish should be tied off and removed daily rather than left to build up, since that's where a lot of the smell returns. Large bags, sturdy boxes and basic cleaning supplies make this faster than carrying loose items out one at a time. Labelled boxes for donations save a second trip, and a simple checklist can create structure on days the job feels endless. Sorting as you go helps create clear piles instead of one heap, and the goal by the end of this stage is a clutter-free space you can actually clean properly. Basic tools such as scrubbing brushes, a decent vacuum, and sealed bags cover most of what you need before calling in help, and the right tools make this stage far less draining. Every hoarder's house is different, so the order you tackle rooms in can shift.
With the clutter gone, you can see what you're dealing with. This is where a proper clean happens, not a light wipe down. Getting rid of ingrained dust and grime is what deep cleaning means, and deep cleaning is usually the most time-consuming stage. Most cleaning services treat this stage as the core of the job.
Floors, walls, light switches, and light fixtures all need attention, since dust settles everywhere in a cluttered home, not just the obvious surfaces. Floors especially need more than one pass, since grime sits in the grain or grout long after the surface looks clean. A high-powered vacuum with HEPA filters pulls fine dust and allergens out of carpets rather than just moving them around. Carpets in particular hold onto moisture, which is why drying them properly matters as much as cleaning them. Soft furnishings that can be washed should go into a hot wash rather than being wiped down, since heat deals with a lot of what's causing the smell in fabric.
For hard surfaces, hospital-grade disinfectant or diluted bleach deals with bacteria and harmful pathogens. A weaker bleach mix suits everyday surfaces, but ingrained grime needs a stronger cleaning solution and more than one pass. Wear gloves, a mask and goggles throughout for safety. Protective gear isn't optional in a house shut up for a long time, since old dust, mould spores and animal waste can all be present. Mould spores and musty odors are often present even in rooms that look clean at first glance. Ignoring health hazards like this at the cleaning stage just means dealing with them again later.
General cleaning gets you most of the way there, but specific odours need specific treatment. Biological stains, including pet or human waste, respond best to enzyme cleaners, which break down the organic matter causing the smell rather than just masking it. Whether it's called odours or odour, the underlying cause needs treating the same way.
Black mould, sometimes searched online as black mould, needs its own treatment separate from general disinfecting. If it covers a large area, bringing in a mental health professional for the household alongside a cleaning professional for the property usually makes mental health support easier to access too. Hoarding disorder is a recognised mental illness, often triggered by stressful life events such as bereavement or divorce.
Mice, moths and other pests are common in homes cluttered for a long time. Waste from pets or other animals, including faeces (or faeces, depending which spelling you search), needs separate handling and its own bag, not mixed in with general rubbish.
Once the source is gone and surfaces are clean, you're usually left with faint, lingering odours in the air and soft materials. This is where absorbers do their job, and it's the stage where a lot of the remaining odors finally clear.
Baking soda left on carpets or upholstery for an hour before vacuuming pulls out residual odour. Activated charcoal works on a similar principle and is particularly good in enclosed spaces like wardrobes. Air purifiers fitted with HEPA filters help clear the air, and running one for a few days after deep cleaning makes a noticeable difference. A well-ventilated space stays smell-free far longer than one sealed up straight after cleaning.
For stubborn cases, some professional teams use ozone generators or hydroxyl treatments, strong enough that they need care and an empty property, so calling in professional help is worth it. Some cleaning services bring commercial-grade ozone equipment for this reason, since domestic units are usually too weak for a severe case.
If the smell has soaked into porous material such as carpet underlay, plasterboard or untreated wood, cleaning alone may not be enough. An odour-blocking primer can seal a wall or ceiling before repainting, but in the worst cases, replacing the material is the only real fix.
In many cases, the smell is close to gone once the rubbish, mould and stains have been dealt with, and what's left is mostly ventilation and time. Open windows daily where you can, and run a dehumidifier in rooms that feel humid or musty even after cleaning. Give the space time to dry before moving furniture back in, since trapped moisture undoes earlier work. Dealing with damp early saves repeat work later.
If the home has central heating or air conditioning, check the system too. HVAC units circulate air through the property, and if they haven't been cleaned in a while, they can spread odour back through rooms you've already dealt with. Cleaning services that specialise in hoarded properties usually check the HVAC system as standard.
A small, contained job is manageable yourself with the right supplies and time. A hoarder's house with severe mould, significant pest activity, or biohazard material is different. Basic safety gear is non-negotiable here, and safety should never be rushed. Professional cleaners carry the training and equipment to handle these health hazards safely, and their cleaning supplies are usually a step above what's sold to the public. Professional cleaning services can move through a property far faster than one or two people, since clearing a house full of hazardous material safely isn't a one-person task. Deep cleaning at this scale is why people call in a cleaning crew rather than tackling it alone. If you're also wondering how much is a house clearance in Liverpool, it's worth knowing that the final cost depends on the condition of the property and the amount of waste that needs to be removed.
A full professional hoarder cleaning typically falls between £2,000 and £8,000, with a lot of jobs landing around £3,500 to £4,000 for a moderate case. Severe properties involving structural repair, extensive pest treatment, or biohazard waste can run well beyond that. This price is a rough guide, and the actual cost varies depending on the size of the property, its location, and what's involved, so a proper quote from a professional cleaning company after an in-person assessment is always the right next step.
Sentimental items slow this process down, and that's normal. Sorting belongings tied to family members or specific memories is rarely quick, and rushing the decision-making process causes more stress, not less. It's fine to set them aside and come back once the space is clear.
A few practical tips beyond the cleaning tips above: label boxes as you go, take before and after photos, and set a realistic cleaning schedule rather than trying to fit everything into one cleaning day. A simple label system can create order fast, even in a room that looks hopeless at first.
Whether you spell it odour or odours, the fix is the same. Remove the source rather than covering it up. Deodorising a hoarder house is a genuine multi-step job: clear the clutter, move into deep cleaning every surface, treat the specific odour sources, absorb what's left, including any lingering odours, then fix the ventilation and moisture so it doesn't return. Every hoarder's house reaches a liveable point eventually; it just takes working through the cleaning process in order.
