When used to clean natural stone, supermarket products can often cause more harm than good as this recent customer of mine discovered this the hard way! Originally from South Africa, she had lived in a flat in Clapham for a couple of years, but had to suddenly return home earlier than expected. However, part of her flat rental agreement required her to leave the property clean and as she found it, including the fantastic Slate shower cubicle. In a rush, the customer had attempted to clean the Slate using a popular supermarket bathroom cleaner. She left the product to sit on the base of the shower before scrubbing it in with an abrasive pan scourer. This was a big mistake – and the customer called me in a panic after discovering that her attempts had left the Slate severely stained. I traveled to the property to see what could be done to set the situation straight. Upon observing the damage in person, I decided that the best course of action would be to use a process known as burnishing to grind away the stains. I tested a small area of the cubicle with one of our handheld diamond encrusted burnishing blocks. Happy with the results of the test Clean, I started to burnish the whole cubicle using our system of four burnishing blocks, starting with the coarsest first and working my way down to the finest. A small amount of water was used as lubrication for each pad. Through the burnishing process, the white stains started to disappear, exposing the lighter grey coloured Slate shower base. After drying the area completely with a heat gun, I was able to seal the stone with two coats of Tile Doctor Colour Grow. This impregnating sealer not only protects the stone but also importantly it restores the natural dark shades in the Slate, enhancing its overall appearance. As an impregnating sealer, Colour Grow penetrates the pores in the stone to fill them and prevent trapped dirt. To say the customer was very relieved would be a complete understatement! By hiring in professional assistance, the customer was able to resolve the situation quickly and painlessly – and more importantly hold onto her £3,000 deposit! Rupert Mcleod West Surrey Tile Doctor