This Sandstone tiled floor with Limestone coloured grout in Cardiff was laid in 2006 and had now discoloured with wear and tear and had almost turned black in places which I suspect was due to no sealer being applied after installation. I carried out a cleaning sample using Tile Doctor HBU Remover, which is a strong cleaning solution, applied it to one tile in the utility room and the dirt lifted off with remarkable results; I then dried the tile with a heat gun to show the customer the
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