The quick trick for removing dirt between grout lines with one swipe.Quickly removes black and grime.I’ll explain in the first comment.

brush.
Allow it to sit for approximately 5 to 10 minutes.
Scrub the  grout gently but thoroughly.
Wipe away the loosened dirt and rinse the area with  clean water.

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If the grout is particularly dirty, you may need to repeat the process rather than applying excessive pressure during the first  cleaning.

Why Grout Becomes Dark

Grout is often more porous than the surrounding tile. Tiny pores and irregularities can trap moisture and particles that a regular mop does not completely remove.

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Kitchen grout may gradually collect cooking grease, food residue, and dust. Bathroom grout is more commonly affected by soap residue, moisture, and deposits from hard water. In entrances and hallways, dirt carried indoors on shoes can quickly become embedded in the grout.

Simply mopping the tile surface may therefore leave the grout looking darker even when the rest of the floor appears clean.

If baking soda alone does not remove the stubborn discoloration, another common household product can provide a stronger cleaning boost.

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2. Hydrogen Peroxide and Baking Soda

Hydrogen peroxide is commonly kept in household first-aid supplies, but it can also be useful for certain cleaning jobs. When used appropriately, it may help loosen stains and brighten some