I have just had my bathroom tiled and grouted and notice that there is gouting dust on the tiles which is the easiest way to remove this please. Thanks
And if it is really, really hard and ingrained in the surface of a textured tile, buy Grout Remover liquid from a tiling specialist and treat with that. Its phosphoric acid that will dissolve the lime in the surface grout without taking it out of the grout lines, so use rubber gloves or it will spoil your 'hands that do dishes'.