Using a soft rubber grout float, apply the grout with diagonal sweeping movements to the grout joints, taking care to fully compress the grout into the full depth of the joints. Work in manageable areas and clean off any residues when the grout has begun to firm up in the joints, but before it sets on the tile face. Cleaning with a damp and not overly wet fine textured foam sponge will provide the best results. Changing the cleaning water as it becomes contaminated will also aid cleaning. When the grout has set, after approximately 5 hours at 20°C, any remaining grout film can be polished off the surface with a clean damp cloth.
N.B. Do not over wet the grout as this will result in a weakened grout joint and can also cause efflorescence, a white soluble salt, to form on the surface of the finished grout joint