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Due to its very high concentration, application of the cleaner is best carried out using a pressure washer. Ideal for large spaces. Requires less effort than a garden spray gun. No need to mix it yourself, as the cleaner should be added neat to the intake tank of the pressure washer. Alternatively, it can be applied using a foam cannon Works on almost all waterproof surfaces, such as: Natural stone, ideal for (mineral) plaster and clinker facade and for cleaning roofs, wood and benches (natural, without oil or varnish), teak garden furniture (natural) and much more. Apply first to a test surface Automatic cleaning: Normal algae will usually disappear within a few days. Black growth generally takes a few months - Can also be used for the treatment of mould stains inside a building. Once dry, the surface may be accessed by humans and animals again. Plants won't die, but if they come into contact with the product they may temporarily turn brown. Biodegradable! Each litre yields up to 61 litres of ready-to-use solution and covers up to 900 m² (applied with the garden spray gun). May vary depending on the surface › See more product details