We have already tried several mold remover, but this product really helps, so we ordered it again. The intense smell of the composition evaporates relatively quickly and as a result remains a clean surface. If one adheres to the instructions and only the amount that you need in a separate bowl used- remains never returned empty in the bottle - remains in the middle, even after prolonged storage, the effect. By regular treatment with mold stop (included), the surfaces remain permanently freed from mold. From me therefore 5 star.