Essential Natural Stone Cleaner is a strong cleaner designed specifically for cleaning natural stone's exterior. Unlike acid-based cleansers, alkaline-based solutions will not damage or erode the stone's surface. It is also suited for use on the majority of other exterior hard surfaces. Apply neat to places with significant surface pollution, or dilute 1:1 for less contaminated areas. Simply apply and leave for 2 hours before washing off. It will quickly remove layers of filth and grime, as well as green algae, lichen, and black spot. Coverage varies depending on surface contamination, but should cover up to 50m2 per 5L container on average. Available in 5L and 25L. HOW TO APPLY: 1. Remove any dust and debris from the work surface before beginning, and make sure you have adequate personal protection, such as gloves , appropriate protective eyewear , a face mask , and clothing. 2. Essential Natural Stone Cleaner should be used neat or diluted 1:1 with fresh water - do a brief area test to determine the most appropriate dilution rate and dwell time. Transfer the cleaning solution from the bottle to a pump sprayer or watering can with caution. An alternative, if these containers are not accessible, the cleaning fluid can be utilised directly from the bucket. Use generously. 3. The cleaning fluid should be left on the applied surface area for at least an hour, and the area must not be left to dry during that period. If required, spray the surface with extra cleaning fluid or clean water to keep it from drying out. If required, use a brush to work the stained area(s), but keep the surface wet at all times. 4. Leave to dwell for at least 2 hours. 5. After at least two hours of residence time, the treated surface area should be rinsed down with fresh water to first neutralise the cleaner before power washing off for best results. Keep in mind that cleaning fluid can damage or even kill vegetation, so avoid splattering it on your garden or lawn grass. If this is inevitable, then rinse with plenty of clean water to dilute the Essential deck Cleaner. 6. In places with significant soiling and ingrained filth, the dwell period of Essential Deck Cleaner may need to be extended to up to 4 hours, or overnight if required, before power washing off. To get ideal results on old, tough black/white lichen spots, test a small region to determine the dwell time needed to remove the stains, then follow the steps above. It is possible that two or three applications will be required. PLEASE NOTE: The primary element in Essential Deck Cleaner is a chlorine-type compound, which will discolour textiles and sensitive materials. During application, take great care to avoid contact with fabrics and tarmac. The fluid may create minor whitening of some surfaces; always test the product on-site in an unnoticeable area before using it.