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How to fix poor-quality grout seams on the facade?

Workers poorly grouted the tiles on the facade. Requires grouting of tile joints. Joints need to go a little deeper and make them even. In what way and with what tools can it be done? It is dangerous to use a grinder or a drill as it can damage the tiles. Suggest a method and the approximate cost of the job. Thank you.

• exterior
• grout joints
• facade