HG Natural Stone Headstone Cleaning Spray 500MLUnder the influence of various weather conditions, mould, algae and moss growth occurs on natural stone, plasterwork, masonry, etc. HG headstone cleaning spray removes stubborn soiling with ease. Spray HG headstone spray from approx. 5 cm distance on the surface to be cleaned and leave to work for 25 minutes. Any remaining dirt can be removed using a cloth or brush. Then rinse the surface thoroughly. Repeat the treatment after approx. 30 minutes in the case of very stubborn soiling. Half a litre of spray is sufficient for approx. 3m surface area. 1 x 500ml HG Natural Stone Headstone Cleaning Spray 500ml Note: Image is for illustrative purposes only and may differ from the actual product.