How to Clean a Filthy House: Step-by-Step Guide

To clean a filthy house, work in this order: make it safe, clear the rubbish, declutter, then clean each room from top to bottom, finishing with the kitchen, bathroom and floors. Doing it in stages stops you cleaning the same surface twice and makes even a disgusting house feel manageable. This guide gives you the full step-by-step method, the kit you need, how long it takes and when it makes sense to call in a professional team.

How to clean a filthy house: the steps at a glance

Step	What you do	Why
1. Make it safe	Gloves, ventilation, check for sharps, pests and mould	Protects you before you touch anything
2. Gather supplies	Bags, gloves, cleaners, vacuum, mop	No stopping mid-task
3. Clear rubbish	Bag and remove all waste, arrange bulk collection	Opens up the space
4. Declutter	Keep, donate, recycle	Leaves surfaces you can clean
5. Clean top to bottom	Ceilings to floors in each room	Dust falls, so you only clean once
6. Kitchen	Fridge, oven, cupboards, worktops, floor	Hardest room, biggest hygiene risk
7. Bathroom	Limescale, toilet, grout, mould	Products need soaking time
8. Disinfect and air	High-touch points, soft furnishings	Finishes the job and clears smells

Step 1: Make it safe before you start

A very dirty house can carry real hazards, so spend ten minutes on this first.

• Protect yourself: wear rubber gloves, old clothes and closed shoes. Use a dust mask for heavy dust or dry mould.
• Ventilate: open windows in every room you work in.
• Check for hazards: broken glass, needles or sharps, animal waste, exposed wiring and signs of rodents. If you find needles, don’t handle them; contact your local council for advice on safe collection.
• Never mix chemicals. The UK Health Security Agency warns that mixing bleach with acidic products (such as vinegar or many limescale removers) releases chlorine gas, and mixing it with ammonia-based products releases chloramines. Use one product at a time and rinse in between.

Step 2: Gather your supplies

Having everything to hand stops you drifting off mid-task. You’ll need:

• Heavy-duty bin bags and a few boxes (keep, donate, recycle)
• Rubber gloves, dust masks and old towels
• Vacuum cleaner with attachments, a mop and bucket, and a dustpan and brush
• Microfibre cloths, non-scratch sponges and a scrubbing brush
• Washing-up liquid, a multi-purpose cleaner, a degreaser, a limescale remover and a disinfectant
• A step stool for high surfaces

Step 3: Clear the rubbish

Go through the whole house with bin bags and remove obvious rubbish first: food waste, packaging, bottles, old post and anything broken. Take full bags outside straight away so the space starts to open up.

For bulky items, use your council’s bulky waste collection, the local recycling centre, or a licensed waste carrier. It matters who you use: householders have a legal duty of care for their waste, and in England councils can issue a fixed penalty of up to £600 if waste you hand to an unauthorised collector ends up fly-tipped. Wales, Scotland and Northern Ireland have their own waste duty rules, so wherever you live, check the collector is registered before handing anything over.

Step 4: Declutter room by room

Once the rubbish is gone, sort what is left. Use three boxes or bags per room: keep, donate or sell, and recycle. Be decisive; if you haven’t used something in a year, you probably won’t. Put “keep” items back where they belong, or in one holding area if their home isn’t clear yet.

If you’re preparing to move out, our guide to areas to empty before a professional deep clean shows what needs clearing.

Step 5: Clean each room from top to bottom

Dust and dirt fall downwards, so always start high and finish low. In each room:

1. Ceilings and corners: remove cobwebs with a duster on a pole.
2. Light fittings, tops of doors and wardrobes: dust before you wipe.
3. Walls: spot-clean marks with a damp cloth and a little washing-up liquid. Test a hidden patch first.
4. Windows and sills: clean glass, frames and tracks.
5. Furniture and surfaces: dust, then wipe with a suitable cleaner.
6. Skirting boards, doors and switches: wipe down, paying attention to handles.
7. Floors last: vacuum thoroughly, including edges, then mop hard floors.

Step 6: Tackle the kitchen

The kitchen is usually the hardest room in a neglected house.

• Fridge and freezer: empty and bin anything out of date, switch off to defrost, then wash the shelves and drawers in warm soapy water.
• Oven and hob: soak racks in hot water and degreaser, then work on the inside. Our step-by-step guide on how to clean a filthy oven covers the details.
• Cupboards: empty, wipe inside and out, and check for signs of pests.
• Worktops and sink: degrease, then disinfect. Descale taps.
• Extractor hood and tiles: degrease the filter and wipe tiles and grout.
• Floor: sweep, then mop, getting into the edges and under the kickboards if they come off.

Step 7: Deep clean the bathroom

• Apply limescale remover to taps, shower heads and screens and leave it to work as the label directs.
• Clean the toilet thoroughly, including under the rim, the base and behind it.
• Scrub tiles and grout. Treat black mould on sealant with a mould remover, following the instructions and keeping the room ventilated.
• Clean the bath, basin, mirror and cabinet.
• Finish with the floor.

If mould keeps coming back, it may be a damp problem rather than a cleaning one. In a rented home, see our guide on whether cleaning mould is the tenant’s responsibility.

Step 8: Disinfect, ventilate and freshen up

Once everything is clean, disinfect high-touch points: door handles, light switches, taps, remote controls and bin lids. Leave windows open for a few hours to clear dust and product smells. Wash soft furnishings such as cushion covers and curtains where the label allows, and consider a professional carpet clean for stained or smelly carpets.

How do you decontaminate a house?

Decontamination goes further than a deep clean: it’s about removing germs or hazardous material, not just dirt. How you do it depends on what you’re dealing with.

• After sickness in the home: clean first, then disinfect. Wash hard surfaces with detergent and hot water to remove dirt, then apply a disinfectant and leave it for the contact time on the label before wiping. Focus on toilets, taps, handles, switches and remote controls, and wash bedding and towels on the hottest cycle the label allows.
• After flooding or sewage: UK government flood recovery advice says to wear rubber boots, waterproof gloves and an apron, clean with household detergent and diluted bleach left for the manufacturer’s contact time, ventilate, and throw away items that can’t be properly cleaned, such as mattresses and wooden chopping boards. Keep children away until the clean-up is finished.
• Animal waste, rodents or heavy mould: wear gloves and a mask, dampen droppings with disinfectant before removing them so dust isn’t stirred up, and double-bag waste. Persistent pest problems need a pest controller first.
• Bodily fluids, sharps, drug use or a death in the home: this is specialist biohazard work. Don’t attempt it yourself; ask your council, landlord or insurer for a licensed trauma or biohazard cleaning company.

Never mix disinfectants or bleach with other products, and keep windows open throughout.

How long does it take?

Home	Rough time for one person
Studio or 1-bed flat, very dirty	1 to 2 full days
2 to 3-bed home, very dirty	2 to 4 full days
Home with heavy clutter or hoarding	Several days to weeks; best done with help

Break it into sessions. Finishing one room completely is more motivating than half-cleaning five.

When should you call a professional?

Get help if any of these apply:

• You’ve found needles, heavy mould, pest infestations or large amounts of animal waste.
• The clutter is so heavy that rooms can’t be used or exits are blocked.
• You’re moving out of a rental and need an agent-standard result for your deposit.
• You don’t have the time, the energy or the physical ability to do it safely.

A professional deep clean works through the full checklist in one visit; across our 3,341 deep cleans since March 2023, the typical final price was £271. For homes with extreme clutter, our hoarder cleaning guide explains how the work is staged, and our hoarder cleaning service is priced on a free quote, with a fixed price agreed before any work starts. If the clutter is linked to difficulty letting go of possessions, the NHS guidance on hoarding disorder explains where to get support. Either way, asking for help is the right call.

Frequently asked questions

Want it done for you? See our fixed prices or request a free quote for a heavy-duty clean, and find your local team through our areas. Get a quote online or call 020 8146 0266.