Possible grout haze/stain on marble tiling Advice and information on tiling and fixing tiles to a variety of surfaces

[lizzieamea]

Hello, we had a new bathroom fitted and tiled a year ago now and there are some creeping brown marks/stains around the edges of most of the tiles. Initially thought this was grout haze but it seems as if the edge of the tile is actually stained after cleaning a small area with bleach/Pink Stuff... now concerned the tiler did not seal the tiles before grouting and now grout has got in to the tiles. Any ideas for fixing this? Thank you!