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Removing grout from a Sandstone fire hearth

Asked by Shirley Sisson from Cumbria: I have a sandstone fire hearth. Some grout had dried onto it. How do I remove it. I am only talking about 9" along where we tiled around the gas fire. Hope you can help

TileProf says: Best to pre-wet the stone with water first, then leave to dry for 15 minutes, then apply some Grout Clean Up http://www.tiledoctor.co.uk/AcidCleaner.html to the affected area, then scrub with a brush straight away, then rinse with water to dilute the Acid as soon as you are finished. Russell Taylor Tile Doctor Ltd

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