How to Remove Mould from Walls and Ceilings

Mould on walls and ceilings commonly develops in damp, poorly ventilated areas or where there is water ingress. Many people try to deal with it using bleach or washing-up liquid, but these options do not always work well, particularly on porous surfaces where mould returns within a few days. For mild cases, white vinegar is a straightforward alternative, provided it is used alongside ventilation, protective equipment and moisture control.

Why does mould develop on walls and ceilings?

Mould requires moisture to grow. This is why it is often found in bathrooms, kitchens, poorly aired bedrooms, walls near leaks and ceilings affected by condensation. A patch may initially look like ordinary dirt, but a musty smell and dark marks point to excessive moisture in the room.

It is important to identify the cause before cleaning. If there is a leak, water ingress or a wall that remains damp, any cleaning product will only work temporarily. The mould may disappear from view, but it will return as long as the moisture remains.

Why does bleach not always solve the problem?

Bleach can quickly lighten the stain, creating the impression that the issue has been resolved. However, on porous surfaces such as painted walls, plaster and ceilings, it may address the appearance rather than the source of the moisture.

Safety is another important consideration. Bleach must never be mixed with vinegar, ammonia or other cleaning products, as this can release toxic gases. Its strong fumes may also irritate the eyes, nose and throat in enclosed rooms.

How to use white vinegar to clean mild mould

For small, surface-level patches, pour undiluted white vinegar into a spray bottle and apply it directly to the mouldy area. Leave it to work for around one hour, keeping the windows open to ventilate the room. Then use a clean, damp cloth to remove any residue and dry the surface thoroughly.

Wear gloves, a mask and eye protection if the area is close to your face, such as on a ceiling. Do not scrub the area while dry, as this can spread spores through the air. It is best to dampen it first, clean it carefully, then dispose of the cloth or wash it thoroughly.

When is it better to call a professional?

If the mouldy area is large, if mould quickly reappears or if a strong smell remains after cleaning, the issue may be deeper than the surface. In these situations, cleaning the visible area will not solve it. There may be water ingress, damaged materials or persistent moisture within the wall.

It is also best not to clean it yourself if there are severe allergies, asthma or respiratory conditions, or if the mould covers a large section of the ceiling. In these cases, removal needs to be handled more carefully to prevent particles spreading around the room.

How can you stop mould from returning?

Cleaning is only truly effective when it is combined with prevention. After removing mould, keep the room well ventilated, dry damp areas, repair leaks and avoid placing furniture directly against cold or damp walls.

The key to getting rid of mould on walls and ceilings is not only the product used, but controlling moisture. White vinegar can help with mild stains, but the lasting solution is a drier, better-ventilated home with no water ingress. Once the underlying cause is corrected, mould is far less likely to return.