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Using a damp sponge to remove grout haze is the proper technique for cleaning tile after grouting. This method is effective because a damp sponge helps to lift the excess grout without removing too much of the grout from the joints. It allows for thorough cleaning while minimizing the risk of damaging the grout lines.

Cleaning immediately with a damp sponge also helps to prevent the grout haze from hardening, which can make it more difficult to remove later on. A damp sponge is gentle enough to avoid scratching the tile surface, ensuring that the tiles remain pristine and free of any residues.

In contrast, using a dry cloth is not effective at removing grout haze, as it will only smear the haze rather than lift it. Washing with soap and water might also be inappropriate immediately after grouting, as soap can interfere with the curing process of the grout and possibly harm the tile finish. Allowing excess grout to dry will lead to a more complicated cleanup process, making it challenging to restore the tile surface to its intended appearance. Therefore, using a damp sponge is the optimal approach for effectively cleaning tiles after grouting.