How to Get Rid of Black Mould on Walls
Step-by-step guide to safely removing black mould from walls using household products.
Small patches of black mould (under 1m²) can be cleaned safely at home using white vinegar or diluted bleach. Wear protective gloves and a mask, scrub the affected area, then dry thoroughly. For larger areas or recurring mould, the underlying damp problem must be fixed or the mould will return.
Last updated: October 2026 ·Practical guidance for Ipswich homeowners
Can You Clean Black Mould Yourself?
Yes, but only if the affected area is small (under 1 square meter) and the mould is on a non-porous surface like tiles or painted walls. You can tackle it with household products.
Do not attempt DIY removal if:
- The mould covers more than 1m² (roughly the size of a doormat)
- It keeps coming back after cleaning
- It is growing on plasterboard, soft furnishings, or inside walls
- You have respiratory conditions like asthma
- The mould is caused by structural damp (rising damp, penetrating damp, or leaks)
In these cases, call a damp specialist. The mould is a symptom of a bigger problem.
What You Need
Pick one cleaning method:
- White vinegar (undiluted): Safer, less harsh, good for painted walls
- Diluted bleach (1 part bleach to 10 parts water): Stronger, faster, good for tiles
- Specialist mould spray: Convenient but expensive
Plus these safety items:
- Rubber gloves
- Face mask (FFP2 or better)
- Old cloth or sponge
- Bucket of clean water
- Old towel for drying
Never mix bleach with vinegar or other cleaners. The fumes are dangerous.
Step-by-Step Removal
- Ventilate the room. Open windows. Keep the door closed to avoid spreading spores.
- Put on gloves and mask. Mould spores irritate lungs. Protect yourself.
- Apply your chosen cleaner. Spray or wipe vinegar/bleach directly onto the mould. Saturate it but do not scrub yet.
- Wait 10-15 minutes. Let the cleaner break down the mould.
- Scrub the area. Use a firm sponge or cloth. Work in circles. You should see the black staining lift.
- Rinse with clean water. Wipe the wall with a damp cloth to remove residue.
- Dry thoroughly. Use a towel to remove moisture. Leave the window open for an hour.
Dispose of the sponge and cloth after use. Do not reuse them.
Why Does Black Mould Keep Coming Back?
Cleaning removes the visible mould but does not stop new growth. Mould needs moisture to survive. If the wall stays damp, mould returns within weeks.
Common moisture sources:
- Condensation from poor ventilation (bathrooms, kitchens)
- Penetrating damp from external wall damage, cracked render, or blocked gutters
- Rising damp from failed damp-proof course
- Leaking pipes behind walls or under floors
If your mould keeps returning, you have a damp problem that needs fixing. Cleaning the mould is pointless without addressing the cause.
When to Call a Professional
Recurring mould is a sign of structural damp. You need a moisture survey to identify the source. A damp specialist will:
- Use moisture meters to measure wall dampness
- Identify whether it is condensation, penetrating damp, or rising damp
- Recommend treatment (ventilation, damp proofing, repairs)
In Ipswich, damp surveys cost around £97+VAT, deductible from treatment if you go ahead.
Frequently Asked Questions
Can I clean black mould myself?
Small patches under 1 square meter can be cleaned safely at home using white vinegar or diluted bleach. Wear gloves and a mask. For larger areas (over 1m²), or mould caused by structural damp, call a specialist. DIY removal only treats the symptom, not the cause.
What kills black mould permanently?
No cleaner kills mould permanently if the damp source remains. White vinegar (undiluted), diluted bleach (1:10 with water), or specialist mould sprays remove surface growth. Permanent removal requires fixing the underlying damp problem through ventilation improvements, damp proofing, or leak repair.
Should I use bleach or vinegar on black mould?
White vinegar is safer for routine cleaning and non-porous surfaces. Bleach is stronger but releases fumes and can damage paint. Never mix bleach with other cleaners. For painted walls, vinegar is the better choice. For tiles and hard surfaces, diluted bleach works faster.
Is black mould the same as mildew?
No. Mildew is surface mould (grey or white, powdery) that wipes off easily. Black mould (Stachybotrys) is dark, slimy, and grows into porous materials. Mildew is cosmetic. Black mould can damage walls and trigger respiratory symptoms.
Can I just paint over black mould?
No. Mould will grow through the paint within weeks. You must remove the mould, fix the damp source, let the wall dry completely, then consider mould-resistant paint as a final step. Painting over mould is a temporary cover-up that makes the problem worse.
Need help with recurring mould?
If your mould keeps coming back, you need a damp survey to find the source. We offer free quotes and fast response in Ipswich. Get in touch or call for same-week appointments.
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Professional Damp Surveys ·Penetrating Damp Treatment ·Condensation Control ·More Guides
Last updated: October 2026