Grout haze can be removed from new tile by simply washing the tiles with warm water and applying a grout haze cleaner. However, it is best to wait until the grout has fully cured before removing any grout haze.
Dip a sponge in warm water and scrub the tiles; a tiling sponge works best. Work on a small area at a time, and allow the tiles to dry. Wash the tiles once more with the sponge and warm water. Mix a few ounces of haze cleaner with a gallon of warm water. Apply the mixture to the tiles with a sponge. Rinse the tiles with warm water and dry with terrycloth.