Clean external areas of natural stone effortlessly with StoneCare4U Essential Natural Stone Cleaner. It is also suitable for use on most other external hard surfaces. Simply apply and leave for two hours, then wash off. It will quickly remove layers of dirt and grime and green algae, lichen and black spots. How To Apply: Before use, remove any loose debris from the area and ensure adequate safety wear, i.e. gloves, suitable protective eyewear, face mask and clothing. The cleaner is to be used neat or diluted 1:1 with clean water – always perform a small test area to determine a suitable dilution rate and dwell time. Carefully transfer the cleaning fluid from the bottle to a pump sprayer or watering can. If these containers are unavailable, cleaning fluid can be used directly from the bucket. The cleaning fluid needs to be left on the surface for at least an hour. During that time, the surface must not be allowed to dry out. If necessary, mist with additional cleaning fluid or clean water to prevent the surface from drying. Work the area(s) of staining with a brush, if necessary, but ensure the surface remains wet at all times. Leave for at least two hours, and after at least two hours of dwell time, the treated area should be washed down with clean water first to neutralise the cleaner before, then power washing off for perfect results. Please note the cleaning fluid can harm or possibly kill vegetation, so try to avoid washing off garden or lawn grass. If this is unavoidable, then rinse with plenty of clean water to dilute the cleaner. In areas of heavy soiling and extreme, stubborn black or white lichen spots, it may be necessary to extend the dwell time to up to four hours or overnight, where necessary, before power washing off. To achieve perfect results on very aged, stubborn black or white lichen spots, test a small area to ascertain the required dwell time necessary to remove the marks – then follow the instructions above. Two to three applications may be needed. Please Note: It contains a chlorine-type agent as an active ingredient and will stain fabrics and sensitive materials. Take special care to avoid contact with fabrics and tarmac during application. The fluid might cause slight lightening of some surfaces – always try the product on-site in an inconspicuous area before use. Coverage: Up to 50m² per 5L when diluted 1:1. Coverage varies depending on surface contamination. Quantity: 5L. Pack of three.