How to remove moisture from walls so it never comes back

Removing mold with bleach
In this case, the solution is palliative, since with this method the mold is completely eliminated, but the moisture remains on the walls.

We start by mixing 1 part bleach to 1 part water, then pour it into a spray bottle, also making sure to wear rubber gloves, goggles and a mask. Finally, we take a brush, spray and rub vigorously.

We must be patient because it takes time. We must do a little every day or week because the smell is very strong and can even make you dizzy. Another measure that we must take is to do it without anyone and in a very ventilated environment. An important recommendation: if we use bleach on colored walls, it will fade. This is a trick specifically designed for white walls and surfaces.
Remove mold with hydrogen peroxide. Another alternative product that can help remove mold is hydrogen peroxide, but it is best used on small stains as it requires a little more work.

Simply dampen a cloth in hydrogen peroxide, place it on the mold to be dampened and let it sit for 15 minutes. After that, rub well until it comes out. This product also requires the use of gloves and a protective mask and make sure to ventilate the area well. We do not allow children in the room during the intervention. Remove mold with water, vinegar and alcohol.
For a more homemade mixture that does not stain the wall, there is an easier method.

You can mix warm water with 1 cup of vinegar and 1 cup of isopropyl alcohol. Together and well mixed, they will reduce mold, remove stains and promote cleaning.
Eliminates moisture by correcting the structure. If you want to permanently get rid of moisture and mold in your home, you must look for other solutions. For this, the advice of a professional is essential, who will evaluate the structure of the house and help us find the best solution.

Once the cause is determined, the solution will come, it usually consists of removing the current cast and recasting it. In this case, a water-repellent liquid is used in the new plaster mix.
In some cases, when the problem comes from below, it may be necessary to break the first meter of wall and coat this part by adding a waterproof mat.
It is not necessary to break the entire wall, just the lower part and little by little. If this part is protected, the upper part will no longer absorb moisture from the ground.
Other methods of eliminating moisture that may also work for you.

Sea salt is very effective in combating humidity because it performs a function very similar to that of baking soda. In addition, it is very simple to use. You will simply place containers of fleur de sel or fleur de sel on the plinth or on the shelves of the walls and little by little it will begin to absorb all the humidity.
Baking soda can also be used in the same way as sea salt, simply placing containers on the walls near the humid area and you will see results in no time.