We were asked to take a look at a natural slate paving leading up to the entrance of a lovely old residence in North London. The slate path had only been recently laid, grouted and sealed and the owner was not best pleased with the results and a request was made to remedy the situation and return the slate back to its natural colour and appearance. We carried out a series of tests to ensure we could remove both the sealer and grout haze from the surface of the tile. It's not a good idea to
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