24 or preferably 48 hours after installing the tile, the floor may be grouted. Use a polymer floor grout mixed with water to a stiff, trowelable consistency. This grout just requires the addtion of water, no latex additives, because it already contains polymer additive to improve strength, adhesion and flexibility. Pack the grout into the joints using a grout float. Remove excess grout from the surface of the tile by drawing the edge of the grout float diagonally across the tile joint. Wait about 15 minutes and then wipe remaining grout off the surface using a DAMP sponge or wet turkish towel working diagonally across joints. Rinse sponge or towel in clean water frequently and wring out thoroughly before continuing to clean floor. After cleaning, tile surface should should be quite clean except for a slight surface haze.
The nest day polish tile with a clean, dry cloth. On stubborn areas use a nylon scouring pad and water or H.G. Extra. Rinse with clean water.