Discuss Black Bal Grout seems to have penetrated through the wall tiles in the Canada Tile Advice area at TilersForums.com.
TippEx
Probably stained then...... black grout is the devil's work.Yes they have a textured surface.
Several cement removers have been used including LTP with a toothbrush but it has made no difference whatsoever.
Tipex would unfortunately be too bright because the tiles are very slightly off white.
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