Using HEPA filter dust extraction equipment, remove grout to sufficient depth to allow new grout to bond securely with tile bisque (unglazed body of tile).
NOTE: Re-grouting without sufficient removal of old grout will result in a temporary cosmetic improvement that will begin chipping and peeling, usually within a few weeks or months. Columbia Tile & Grout will not employ this practice for any reason.
Kill visible mildew.
Install new mildew-resistant grout.
Buff the tile surface to remove grout haze, soap scum, and mineral deposits.
Recaulk all plane-change joints (e.g. corner joints) and joints between tile and non-tile materials with mildew-resistant caulk. This includes both sides of door frames and tracks.
Seal all new grout with sealer that repels water and most stains.
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