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Black mark removal

Asked by Jo Evans from Peterborough: We have some very old quarry tiles (100's of years old) in our fire places. I have tried cleaning them with an acid based cleaner, this just seems to make the black marks more prominent.

gpslancaster says: Best to try a Strong Alkaline cleaner such as Tile Doctor Pro-clean http://www.tiledoctor.co.uk/TileGroutCleaner.html test out a small area first and give it a good scrub with a brush and some warm water mixed with the Pro-clean at a 50/50 mix. Rinse with water after cleaning. Russell Taylor Tile Doctor Lancaster

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