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Newly laid tiles stained by grout

Asked by Steve from St Ives: I have just laid ceramic floor tiles and grouted with a flexible grey grout. Despite cleaning off the grout haze as I went along, to my horror the tiles have been stained a dirty grey colour. I have tried scrubbing them but to no avail. Reading the small print on the grout (Mapai Flexible Grey Grout)says this can occur and I should have tested a small area first. Is there any way I can restore the tiles to there original colour?

gpslancaster says: If the grout was flexible it will contains polymers which you can be broken down with a product we call Remove and Go (follow the instructions on the back of the bottle). Scrub and rinse with water when you are finished; once dry apply Tile Doctor Grout Clean Up on the Tiles and this should make the Grout Fizz, brush this in straight away and then rinse with water when you are finished. Russell Taylor Tile Doctor Lancaster

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