Give the grout 20 minutes to dry, then use a clean, damp sponge to wipe off the excess grout. As with the squeegee, you'll get the best results by running it across the tile at a 45° angle. After every stroke, rinse the sponge to keep it clean and squeeze it out so it's not too wet. Once the grout has cured for 24 hours the tile is ready to walk on.