How to Remove Mould from Walls and Ceilings

Mould on walls and ceilings commonly develops in damp spaces, areas with poor ventilation or places affected by water ingress. Many people try to deal with it using bleach or washing-up liquid, yet these solutions do not always work well, especially on porous surfaces where the mould returns within a few days. For minor cases, white vinegar is a straightforward alternative, provided it is used alongside ventilation, protective equipment and moisture control.

Why does mould form on walls and ceilings?

Mould requires moisture in order to grow. It is therefore often found in bathrooms, kitchens, poorly ventilated bedrooms, walls near water ingress and ceilings affected by condensation. A mark may initially look like ordinary dirt, but a musty smell and dark patches signal excess moisture in the room.

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

Why does bleach not always solve the problem?

Bleach can lighten a stain quickly, 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 more than the source of the moisture.

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

How to use white vinegar to clean light mould

For small, surface-level marks, 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 for ventilation. Then wipe away the residue with a clean, damp cloth and dry the surface thoroughly.

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

When is it best to call a professional?

If the mouldy area is large, the mould returns quickly, or a strong smell remains after cleaning, the issue may be deeper than it appears. Surface cleaning will not resolve it in these circumstances. There may be water ingress, damaged material or ongoing moisture within the wall.

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

How can you stop mould from coming back?

Cleaning is only truly effective when it is paired with prevention. Once the mould has been removed, 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 lies not only in the product used, but in controlling moisture. White vinegar can help with light mould marks, but a lasting solution depends on a drier, better-ventilated home free from water ingress. Once the underlying cause has been fixed, mould is far less likely to return.