When repairing grout, which step is the most important?

Cleaning thoroughly is the most important step when repairing grout because it ensures that the new grout will adhere properly to the surface. Any dust, dirt, or old grout residues left on the surface can prevent the new grout from bonding effectively, leading to poor results or a repair that fails prematurely. A clean surface allows for better penetration and adhesion of the grout, enhancing the durability and appearance of the repair.

Moreover, thorough cleaning can help to remove any mold or mildew that may have accumulated, which is essential for maintaining a healthy and long-lasting grout line. This preparatory step lays the foundation for the succeeding applications, making it crucial to a successful grout repair. Once the cleaning is done properly, the other steps like applying new grout, sealing, and choosing the right color can be executed effectively and with greater confidence in the long-term durability of the work performed.