Mold-removing chemical products are good but the mold keeps growing back.
What is an efficient permanent solution?
Removing the cause of the problem rather than the problem itself is the only real solution to permanently remove mould .
For mould the usual culprit is moisture. In most cases the moisture will come from one of two places:
If the moisture is coming from the air (e.g. a steamy bathroom or a cold hallway) the problem is managed (perhaps not completely fixed) by removing moisture from the air. To remedy this you can try:
If the moisture is coming through the walls, floor or ceiling, the problem is much more difficult and will probably require a professional damp proofing course.
You will also need to remove the mould completely to reduce the chance of spores multiplying again. The chemical sprays you use already are probably enough for this.
Black mold is caused by Stachybotrys (also known as "toxic black mold" in the US( and it's usually associated with poor indoor air quality that arises after fungal growth on water-damaged building materials and exposure can cause adverse health effects.
The worst-case scenario for homeowners is produced by consecutive episodes of water damage that promote fungal growth and mycotoxin synthesis, followed by drier conditions that facilitate the liberation of spores and hyphal fragments2003.
Remember that simply killing the mold with a biocide is not enough. It can grow on any substance (on wood, paper, carpet, and foods) and there is no practical way to eliminate all mold and mold spores in the indoor environment. The way to control indoor mold growth is to control moisture.
The first step is solving an indoor mold problem which is always stopping the source of moistureEPA:
Secondly get rid of mold it-self:
After removing mold, here are the things which can prevent mold keeps growing back:
If above conditions causing the mold growth are not corrected, mold growth could recur.
In case where the area of mold is large you should hire a remediation manager to properly dispose of the mold or consult with a qualified professional.
Depending on the environment this is happening in (pets, children, food preparation, ...) this permanent solution might not apply.
A bit of back-ground: Mould is one of the oldest life forms on Earth and thus pretty resistant to pretty much everything... You can temporarily stop growth, but even bleach, ammonia, ... are no permanent solutions.
The solution: Before attempting any of the following remedies, you need rubber boots, chemical gloves and a gas-mask.
Therefore, use the following: (higher number = more effective = more toxic)
Peroxide: The Marilyn Monroe of the solutions, but not the normal pharmacy 2%, but the nasty 30 or 40% industrial-strength product. It works by releasing ionic oxygen, so the gas-mask might seem superfluous but is really needed as it'll burn your lungs. 30-40% Peroxide also stings like hell if even a tiny drop gets on your skin and feels like someone is poking you with a needle for an hour or so (though no permanent damage will be done, happened quite a few times to myself).
Use a natural sponge (no synthetics!) to scrub off the mould and soak all the tiny cracks the mould is growing out of... You'll notice a slight fizzying as you apply this: this is absolutely normal as the ionic oxygen is being released. Don't just clean the area with the mould itself, but clean as much around it as well as the spores will be everywhere. If possible, clean the walls, floor and ceiling as well in the room/corridor/basement this is happening in. (Don't use a vacuum cleaner: it'll make things worse)
Sulphuric acid: The vitriolic of the solutions, just not the normal battery acid (5%), but real vitriol that is hygroscopic and will not only liquefy any deep spores, but pull out microscopic amounts of water from the cracks that contain the mycelia. No need to describe what vitriol does to your skin: a mummy will look fresh compared to a skin that gets even a tiny drop on it!
Use a high-quality synthetic sponge and please don't apply this on wood, calcium-containing stone (bluestone, sandstone, calcite), metal or similar materials (bricks, cement, concrete are no problem). You'll notice a bit of heat as you apply the vitriol; this is due to the hygroscopic effect and is absolutely normal. Again: don't just clean the moulded area, but as much around it as well to kill off the spores as with solution #1.
Potassium Cyanide: This is the kill-all of cleaning products! Containing a triple Carbon-Nitrogen bond it breaks open any mould DNA down to the molecular level and leaves behind the most sterile and clean area you've ever witnessed. Just add it to water (even a 2% solution will work great!) and again use a sponge (synthetic or natural: now it doesn't matter) and the same physical treatment as the above solutions. This is the most permanent solution of all!
Whichever of the solutions you took, it's important to let the entire room dry (adding an air conditioner set to dehumidification mode is an asset) as mould needs water (even in microscopic quantities) to flourish!
Final warning: If you would want to apply all of the above, please allow sufficient time between applications as mixing the vitriol with the Potassium Cyanide will generate Hydrogen Cyanide: a gas smelling of nice raw almonds that kills any oxygen-breathing life-form on Earth within seconds!
And finally: apply another coat of water-resistant paint to the surfaces thus treated!
I have the same problem and I have tried with white vinegar and after several months bleach spray for mold removing (which is not exactly a lifehack but works). The spray works better for me, but smells bad and it is very toxic.
I have made a little research and I found the following strategy:
some cons of this method are:
If the moisture comes from the wall first you have to make proper isolation.
If the moisture comes from the air then you have to reduce air humidity (ventilation, electric dehumidifier). Find the source of humidity and remove it. Sources of humidity can be household activities such as cooking, washing; big plants; water leakage due to plumbing problem somewhere in the house.
You have not said where this mould is or what the conditions are. So here is just a helpful guess.
Firstly, the mould spores are always there, you can't get rid of them forever, so you have to stop them from flourishing. Most of all you have to get it dry. Ventilate! Move your furniture and stuff an inch (25 mm) away from the wall. Dry the spot by using heat. Of course this may spread the spores around the place, wash them off first. Make sure your problem areas are always well ventilated. If this is a bedroom then get used to sleeping with an open window.
-Using a dehumidifier is a good short-term solution, but uses a lot of electricity.
-Never ventilate on a warm day when outside is warmer than in. Otherwise warm, moisture-laden air comes in and the water condenses on your cool areas.
That's the first step. Now we have to stop moisture from collecting in corners and similar spots. It does this where one spot is colder than the others. If the house belongs to you then insulate it on the outside. Otherwise talk to your landlord about it. Often cold spots are above window frames because the house structure has design faults. You might like to insulate on the inside, though that's not the optimal solution.
So your answer is to ventilate and insulate.
edit: a new point I thought of. You can paint the problem area with fungus-preventing paint. I got some of this for the north side of my garage and it works very well. However, this is probably not suitable for indoors - but you could ask in the paint shop.
Many mold killing products contain chemicals. These chemicals can be allergenic, bad for the environment, and bad for your family and pets.
Vinegar, on the other hand, is a natural acid. Vinegar is totally non-toxic and safe of course. You can drink it, afterall. Vinegar is also biodegradable and fine for the environment.
Although vinegar leaves a strong smell, the fumes are not harmful at all.
It is very cheap to buy vinegar. You can easily find bottles of white vinegar in the supermarket.
We had black mould spores growing on our basement walls because we had a water leak behind the wall that we were not aware of. Once we got the water leak fixed we were left with the job of getting rid of the black mould spores on our wall. We found a fantastic mould spray that completely got rid of all the black mould spores and they haven't come back since.