Simply spray on the affected surface at a distance of 3-6 cm and allow 10 -20 minutes for the product to get to work, then rinse off with water or a sponge - NO scrubbing required. Always test on an inconspicuous area before treatment. Contains Sodium Hypochlorite. All brown and black stains caused by mould, fungus and algae can be treated with this product including damp plastered walls and ceilings in the home. These black or brown marks can be found anywhere in the home but are most common on the silicon seal between the bath tub, on the edges of tiles, on shower cubicles and on plaster. This 750ml with a spray nozzle for easy application is excellent value for money. Our unique formula even helps to prevent regrowth for up to 6 months meaning you don't have to worry about re-applying every few weeks. One of the most POWERFUL and effective mould killers on the market - even used by professionals. It effectively kills ALL brown and black stains caused by mould, fungus and algae.