Removing mold from walls

What appears on walls as a "black-green mold stain" can actually indicate several problems: on the outside, in addition to mold, there may be colonies of lichen and algae. On internal walls, however, the origin of mold is usually condensation humidity.

Bleach-based products cleaning is typically not sufficient: where organic growth has initiated, it can be spread in surrounding environments by airborne spores. 

To effectively and permanently remove mold from walls and prevent a new proliferation of microorganisms on internal and external wall surfaces, it is necessary to use specific scientifically formulated products.