Call Tile & Stone Medic! It sounds like your grout may be contaminated we frequently fix discoloured grouting.
https://tileandstonemedic.co.uk/wp-content/uploads/2013/08/TSM-LOGO-A5LIGHT-011.png00Graemehttps://tileandstonemedic.co.uk/wp-content/uploads/2013/08/TSM-LOGO-A5LIGHT-011.pngGraeme2017-01-13 12:08:562020-10-02 13:31:38Dark marks have appeared on my grouting, what should I do?
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