How to Remove Mold from a Wall and Keep It from Coming Back?
updated 11 July 2026
Quick answer
Wipe small surface patches with vinegar or a ready-made fungicide, wait the recommended time and scrub off the growth, working in gloves with the window open. Once the wall has dried, apply an anti-fungal primer and paint with a biocide paint. To keep mold from returning you have to remove its cause, which is excess moisture - improve ventilation and heating.
Step by step
- 1
Assess the scale of the problem
Check whether it's surface growth on the paint or mold that has gone deep into the plaster. Press and tap the wall - if the plaster is soft, damp or coming off in flakes, the infestation runs deep and washing alone won't be enough. You can handle dry, surface patches the size of your hand yourself; extensive damp means the plaster has to come off.
- 2
Protect yourself and the room
Keep a window open for the whole job so there's a constant draft. Put on gloves, and for larger patches also goggles and a mask, because the scraped-off growth gives off dust. Move furniture away from the wall and cover anything you don't want dirty with plastic sheeting.
- 3
Apply a treatment to the patches
Spray or wipe vinegar onto small patches and leave it for an hour, then scrub the spots off with a brush and cloth. Instead of vinegar you can use a ready-made fungicide, following the instructions on the packaging. Don't mix a chlorine-based product with vinegar or other preparations - the combination gives off irritating fumes.
- 4
Scrape and dry the wall thoroughly
After removing the growth, scrape off loose paint and crumbling plaster down to sound material. Dry the spot, helped along by a space heater or airing the room, until the wall is dry to the touch. A damp surface won't take primer well and the mold will quickly return.
- 5
Prime the surface with an anti-fungal product
Apply an anti-fungal primer to the clean, dry wall and wait the drying time given in the instructions. The primer strengthens the surface and makes it harder for spores to settle again. Only apply skim coat or paint once the surface is prepared this way.
- 6
Paint with a biocide paint
Finish the wall with a paint containing a biocide, designed for rooms exposed to moisture. Such a coating resists fungus longer than ordinary emulsion paint. Follow the first coat with a second once it has dried, so the color covers evenly.
Moisture is the real cause of mold
Mold grows where moisture lingers, so just washing off the patches doesn't solve the problem. The most common sources are thermal bridges, the cold spots in a wall where water vapor condenses, along with poor ventilation and drying laundry indoors.
Watch out for furniture pushed up against a cold exterior wall - there's no air circulation behind a wardrobe, and that's exactly where mold appears most often. Pull furniture a few centimeters (an inch or two) away from the wall so air can circulate freely.
Control the humidity in your home
Buy a cheap hygrometer and keep an eye on the air humidity - aim to keep it in the 40-60 percent range. Above that level, vapor starts condensing on cool surfaces and creates the conditions fungus needs.
Air rooms briefly but intensively - open the windows wide for a few minutes several times a day instead of leaving them tilted for hours. When cooking or showering, run the extractor fan or open a window so steam doesn't settle on the walls.
When mold comes back despite cleaning
If the patches keep appearing in the same spot despite thorough removal and repainting, the cause is structural. It could be a wall that freezes through, a leaky roof or window, damp rising from the foundations or ventilation that isn't working properly.
In that case you need diagnostics - a thermal imaging camera will reveal thermal bridges, and a plaster moisture reading will show whether water is getting in from outside. Until the source of moisture is removed, every repaint will only be temporary.
Frequently asked questions
›How do I remove fungus from a wall with home remedies?
Vinegar works on small patches - spray it on, leave it for an hour and scrub off the growth with a brush, working in gloves with the window open. After cleaning, dry the wall and protect it with an anti-fungal primer. Home methods are only enough for surface-level growth.
›Does vinegar really kill mold?
Vinegar handles surface growth on paint or grout well. It won't, however, remove mycelium that has grown deep into damp plaster - that calls for ready-made fungicides and often hacking off the plaster.
›How do I get rid of damp at home so the mold doesn't come back?
Air rooms briefly and intensively several times a day, don't dry laundry in closed rooms and move furniture away from cold walls. Keep the air humidity in the 40-60 percent range, checking it with a hygrometer. If it's still too damp, check that your ventilation isn't blocked.
›Why does mold appear behind a wardrobe or in the corner of a room?
Those are usually the coldest spots in a home, where an exterior wall meets the ceiling or where furniture blocks the air flow. Water vapor condenses there most easily and creates the conditions fungus needs. Moving furniture away and heating those corners better helps.
›When should I call in a damp specialist?
When mold returns in the same spot despite cleaning and repainting, or covers large areas of the wall. That signals a structural problem, which thermal imaging and moisture readings can pinpoint. Without removing the source of water, no repair will last.