Clean the Excess Grout
Let the grout just begin to harden then, before it hardens fully, wipe off the grout from the surface of the tile with a damp sponge (Image 1 and 2). A sponge with larger pores is most effective for this. Wipe lightly so as not to remove the grout from between the tiles.
Once the grout is mostly hard, wipe off the surface again with the sponge.
After the grout hardens, wipe off the haze left on the tile surface with a clean soft cloth.
Avoid walking on the newly grouted area several hours.