Grout is often more porous than the surrounding tiles. Its tiny pores and uneven surfaces can trap moisture and particles that an ordinary mop cannot completely remove.
Kitchen grout can accumulate cooking grease, food residue, and dust. Bathroom grout is more frequently affected by soap residue, moisture, and deposits from hard water. Near entrances and in hallways, dirt brought in on shoes can quickly become embedded in the grout.
That is why simply mopping the tiled surface may leave the grout looking darker, even when the rest of the floor appears clean.
If baking soda alone does not remove stubborn discoloration, another common household product can provide a stronger cleaning solution.
2. Hydrogen Peroxide and Baking Soda
Hydrogen peroxide is commonly kept in household first-aid kits, but it can also be useful for certain cleaning tasks. When used appropriately, it can help loosen stains and brighten some types of grout.
For stubborn stains, you can prepare a simple cleaning mixture:
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Sprinkle a small amount of baking soda onto the grout.
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Add enough hydrogen peroxide to moisten the baking soda and form a paste.
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If necessary, add one drop of mild dishwashing liquid to help loosen greasy residue.
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Leave the mixture on the grout for approximately 5–10 minutes.
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Scrub with a toothbrush or grout brush.
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Rinse thoroughly with clean water and dry the surface.
Use ordinary household-strength hydrogen peroxide and avoid mixing it with other cleaning products. Using more products does not necessarily improve cleaning, and excessive chemical use can damage certain surfaces or grout sealants.
