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How to Remove Mould From Walls Safely
Updated 3 November 2026. Reviewed by Michael Young, Head Contractor at Advanced Damp (CSSW and FODCS).
Key Takeaways
- Small areas of surface mould on walls can usually be cleaned safely at home with the right protection and products.
- Wipe, do not dry brush. Brushing releases spores into the air.
- Mould will come back unless the moisture that feeds it is dealt with, which is usually condensation.
- Large areas, mould that keeps returning, or mould linked to a leak or damp wall need professional investigation.
Black mould on walls is unsightly, it smells, and it can affect health, particularly for people with asthma, allergies or weakened immune systems. The good news is that most mould on walls is surface growth that can be removed. The important part is stopping it coming back. This guide explains how to remove mould safely, which products work, and how to prevent it returning.
Can You Remove Mould Yourself?
As a general guide, you can clean mould yourself if it covers a small area (less than about one square metre), it is on a hard surface such as painted plaster or tiles, and it is not linked to a leak or sewage. Get professional help if the area is large, if mould keeps returning after cleaning, if it is growing on soft materials such as plasterboard, carpet or timber that may need removing, or if anyone in the home has a respiratory condition. Our guide to whether black mould is dangerous to health explains the risks.
Safety Precautions First
- Wear rubber gloves, goggles without ventilation holes, and a disposable mask (an FFP2 or FFP3 mask gives better protection than a basic dust mask)
- Open windows but keep the door closed so spores do not spread through the home
- Remove soft furnishings and clothing from the area
- Keep children, pets and anyone with breathing problems out of the room
- Never mix bleach with other cleaning products, especially those containing ammonia
What You Will Need
- A bucket of warm water with washing up liquid, or a mould remover spray
- Disposable cloths or sponges
- A spray bottle
- Plastic bags for disposing of cloths
- Optional: white vinegar, or a fungicidal wash for repeat problems
How to Remove Mould From Walls: Step by Step
1. Spray Lightly
Lightly mist the mouldy area with water or your cleaning solution. This stops spores becoming airborne when you wipe.
2. Wipe, Do Not Brush
Wipe the mould off gently with a damp cloth. Fold the cloth to a clean face as you go, and avoid dry brushing or scrubbing hard, which spreads spores.
3. Treat the Area
Apply a mould remover or fungicidal wash according to the manufacturer’s instructions, and leave it for the recommended time.
4. Dry the Surface
Wipe the area with a dry cloth and let it dry fully. Use heating and ventilation to help.
5. Dispose of Waste Safely
Put used cloths in a plastic bag, seal it and put it in the outside bin. Wash your clothes afterwards.
6. Redecorate Carefully
Once the wall is dry and the cause is fixed, an anti mould paint can help. Painting straight over mould will not solve it, as our article on whether you can paint over mould explains.
Which Products Work Best?
- Soapy water removes surface mould from hard, non porous surfaces and is the gentlest starting point.
- Mould remover sprays are designed for the job and work well on painted walls and tiles. Follow the label and ventilate the room.
- White vinegar is a popular household option for light mould on hard surfaces.
- Bleach removes staining on hard surfaces but does not penetrate porous materials, and the fumes need good ventilation. It should never be mixed with other cleaners.
How to Stop Mould Coming Back
Mould needs moisture to grow. In most homes that moisture comes from condensation: warm, moist air from cooking, washing, drying clothes and breathing settling on cold walls. To keep mould away:
- Use extractor fans when cooking and showering, and leave them running for a while afterwards
- Dry clothes outside or in a vented dryer where possible
- Keep the home evenly heated rather than letting rooms get very cold
- Open windows regularly, even briefly, to let moist air out. See does opening windows reduce damp.
- Leave a gap between furniture and external walls
- Consider a dehumidifier in problem rooms, or a positive input ventilation unit for whole home ventilation
If mould keeps returning despite this, the cause may not be condensation at all. Penetrating damp, leaks and rising damp can all create damp patches where mould grows. Our guide to the difference between damp and mould explains how they are linked.
Professional Mould Removal
Advanced Damp provides mould removal and condensation control across London and the surrounding counties. We find out why the mould is growing, remove it, and put the right ventilation or damp repairs in place. Book a condensation and mould survey if mould keeps coming back.
Book a Survey Now
Book a no obligation survey now. Our team is here to help. Take the first step towards a guaranteed solution by filling out our form below.
Frequently asked questions
What is the best way to remove mould from walls?
Use a dedicated mould removal product or a diluted fungicidal wash, wipe rather than dry brush to avoid spreading spores, and wear gloves and a mask. Dispose of cloths afterwards and let the area dry fully.
Does bleach kill mould?
Bleach can remove the staining on hard surfaces but does not reach mould roots in porous materials such as plaster. A fungicidal treatment and fixing the moisture source work better.
Why does mould keep coming back?
Mould returns when the conditions that caused it remain, usually condensation from poor ventilation or a damp problem in the wall. Cleaning alone will not stop it.
Why does mould keep coming back on my walls?
Because the moisture feeding it is still there. In most homes this is condensation, so better ventilation and heating are needed. If mould returns quickly in one spot, check for a leak or penetrating damp.
Is it safe to sleep in a room with black mould?
It is best to clean the mould and deal with the cause as soon as possible, especially for children, older people and anyone with asthma or allergies. If you are concerned about symptoms, speak to your GP.
Reviewed by Michael Young, Head Contractor at Advanced Damp (CSSW and FODCS). Last reviewed November 2026.
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Sam Fitzgerald is the founder of Advanced Damp and a working damp and structural waterproofing surveyor diagnosing and treating moisture problems in residential and commercial properties across London and the South East. He is FODCS certified (a Federation of Damp Certified Surveyor) and a member of the Federation of Damp. His hands-on work covers rising damp, penetrating damp, condensation, basement waterproofing to BS 8102, and thermal imaging surveys, and he has personally completed over 400 damp surveys across properties of every type and age. Everything he writes draws directly from jobs he has carried out. He does not write about treatments, products or causes he has not dealt with first-hand in the field.
