Patio Black Spot Remover For Natural Stone Patio Black Spot Remover for Natural Stone is a targeted treatment that tackles stubborn black stains on patios, restoring the natural colour and texture of garden stonework. It is designed for tradespeople who need reliable results on stone surfaces such as Indian Sandstone, York Stone, Limestone and Travertine. Features Two size options: 4 Litres treats up to 20 m²; 2 Litres treats up to 10 m² Safe biodegradable and acid free formula Suitable for Indian Sandstone, York Stone, Limestone, Travertine including Portland and Bath Stone, and other natural stone Deep acting formula that lifts discolouration from the surface without damaging the stone or pointing Gently lifts dirt and grime, making follow up cleaning easier Rinses away cleanly and can be rinsed into flower beds or lawns without harming plants Pet safe after application; keep pets off the area during treatment Test on a trial slab first; older or heavily stained surfaces may require additional treatment Coverage guidance: the stated rate is based on a patio around three years old; older stones may need extra treatment Suitable for use as part of a maintenance plan to prevent staining and discolouration over time Benefits Restores the original colour and texture of natural stone Removes stubborn black staining that standard patio cleaners may miss Lower risk of surface damage compared with aggressive high pressure washing Helps prolong the life of stonework by reducing ingrained discolouration Environmentally responsible cleaning that is safe for plants and wildlife once rinsed Simple and practical maintenance that delivers enduring, natural looking results