Grout absorbs dirt, stains, and grime that can build up and cause discoloration over time. Restore grout to its original look with Zep Grout Cleaner & Brightener Gel. The professional-strength acidic formula is designed to clean and brighten all grout colors without the need for heavy scrubbing. The thick gel clings to vertical grout lines, penetrating deep to lift stubborn stains. Ideal for refreshing grout on shower walls, kitchen backsplashes, and ceramic countertops.