You can apply it directly to mouldy tile grout and let it sit, then scrub and rinse. If you're in the mood for a science experiment, first apply the baking soda paste described above to the black ...

In the above bathroom, they are paired stylishly with hexagonal white ties with dark grout in the shower enclosure and a simple square tile going up the wall. The mixture of black and white tiles ...

be sure the grout doesn't contrast too sharply with the tile (i.e., white tile with black grout). Think about how the bathroom tile will feel. Will you have a shower bench? When using tile in a shower ...