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How to repair grout
Clean the damaged grout with white vinegar and water.
That way you can see the exact color of the grout and buy new grout that matches it. Mix one part white vinegar and one part water in a bowl or bucket.

Options are: 1. Make sure to stir the mixture well to ensure that the vinegar and water is well blended. If you plan to use the grout in a shower, skip this step if you intend to use it for washing your legs.; 2. Dip a sponge in the vinegar and roll it over the affected grout. Then, wipe the floor again with a clean sponge.; 3. Then, dip a piece of old t-shirt into the vinegar. Use a sponge dipped in white vinegar to scrub the ceiling.; 4. Then, dip a clean toothbrush in the mixture and scrub the damaged grout until all the dirt and grime comes off. Wipe away the excess mixture with a cloth.;
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