Please don't be confused by the appearance of the result. The fungal spores, i.e. the harmful part of the mould, are gone with the product. The stains are not removed well due to the lack of chlorine. You simply have to scrub a lot more by hand. Javel water is NOT a solution to the mould problem. It only bleaches out the stains, but the mould spores remain! If you are concerned about your health, don't be fooled by the appearance, use a product that kills the mould spores and doesn't just remove the stains.