Surely on many occasions, you have seen mouldy, damp spots on the walls of a home. This is not a problem that can be solved with express cleaning but requires more in-depth interventions.
Do you know what mould is, why it occurs and, more importantly, how to remove mould for good?
What is mould, and why is it generated?
Moulds are microorganisms that appear and develop in humid areas. It is harmful not only to homes but also to the people who live in them since moulds are transmitted by spores that spread through the air.
The rooms where it appears the most are the kitchen and the bathroom because, in addition to humidity, it finds organic matter in them to feed on.
How can I remove mould from walls?
The yellow-green or black stains that we see on the walls of our home or in the joints of the kitchen or bathroom tiles denote that we have a moisture problem.
We must start by solving the moisture problem so that the mould disappears. For this, it is essential that the room is periodically ventilated and, as far as possible, receive sunlight. Also, we must not forget that the application of cleaning products regularly is essential for the elimination of the mould.
It is necessary to scrape the affected area and surroundings with sandpaper or a spatula to remove the layer of plaster in poor condition. We will verify that it comes off easily when scraping it to repair plaster walls. It is possible that if the affected area is very large and all the plaster comes off, the intervention of a professional may be necessary for its repair.
On painted walls, the best solution, as long as the wall is not very affected, is to clean it with diluted bleach (3 parts water to 1 part bleach) and a cloth or sponge. You should put on gloves and goggles before applying them since bleach is a toxic product. Once we have removed all the mould, we recommend repainting the wall with an adherent primer and anti-mould paint.
Is it advisable to use a dehumidifier?
It should be noted that most mould stains are caused by condensation moisture inside homes. When we talk, shower, and even breathe, we increase the humidity levels in the environment.
The best solution to remove mould is to install a dehumidifier that removes that condensation. These devices can reduce ambient humidity from 100% to 50%, so they are really effective as a remedy for this problem.
Homemade tips to get rid of mould
We will show you some of the different remedies to get rid of mould:
As we have said before, we can apply bleach diluted in water. Bleach is a powerful fungicide that is probably in every household cleaning kit. We must mix one part of bleach with three pieces of water. Once applied, rub the stains with a cloth or sponge until the mould is completely removed.
3% hydrogen peroxide should be used, and let it act on the stains for 10 minutes. Then, we rub with a damp cloth until we finish the entire colouring. We can also combine hydrogen peroxide with baking soda and white vinegar, using it similarly.
The best solution against mildew is to spray the stain with apple cider vinegar. If the affected area is very large, you can dilute the vinegar with water to avoid a strong smell. However, if you can apply it pure, it will be much more effective. You can also add a few drops of essential oils to make the smell more pleasant.
Once applied, let it act for a few hours and then rub it with a brush until all traces of fungus are removed.
Tea tree oil
If you want to completely clean the wall with a natural remedy, use tea tree oil.
- Mix two teaspoons of oil with two cups of water and spray it on the stain.
- Do not clean or rub it, as the strong smell of the mixture will do all the work, removing all the mould from the wall.
You must mix 20 drops of extract and two cups of water, and even if it does not have a strong smell, it will eliminate fungi from the walls. Spray the mixture and let it act.
It is a natural product we use in the elimination of mould. Mix it with water and use a sprayer to apply it to the entire affected surface. Then rub it with a cloth and, to finish, clean the whole surface with a cloth dampened only with water.
How to prevent mould from reappearing
If you no longer know what to do, you can always resort to the chemical products you can find on the market, which will help you get rid of mould stains you have at home. We will show you some of the ones you can use.
It is a very useful product in these cases, which differs from any other similar item in that it only needs one application to kill the mould.
To apply it, you must protect yourself adequately because it is a very toxic product and keep the area where you have used it clean to avoid the spread of spores that may have remained on the treated surface.
The anti-mould paint should not be applied directly to the fungi. It is necessary to clean the area first with one of the solutions that we have previously proposed, either a home remedy, such as bleach, or an anti-mould spray.
This solution prevents the appearance once the paint is applied, but not the mould that we already have on the wall to be treated.
They are used to prevent the appearance of fungi due to water filtration problems, mainly in joints of sanitary ware and bathtubs.
They contain acetic acid, which is a strong fungicide, so it prevents the appearance of mould in the joints.
If you don’t know how to remove it on your house, don’t hesitate to contact the professionals at That’s Cleaning: we will visit the affected area and give you the most appropriate solution for your problem.