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Mold is a kind of fungus that develops from airborne spores. It usually grows in damp, warm conditions without much airflow, which is why household bathrooms and loft spaces often suffer from mold. It is often simply caused by humid conditions and lack of ventilation.
While bleach work well to kill mold but bleach in its liquid state is not good enough to killl mold in porous surface. Mold spores tend to spread its roots into such surface, with the use of 3 part of baking soda and 1 part of bleach it forms a bleach paste where allows the paste to stay and bleach to seep into the porous surface to eliminate the spore roots.