Grout looks nice in a kitchen, but it can be difficult to clean. Dark stains in particular are hard to remove. When coffee stains grout, it will take a vinegar solution and deep scrubbing to get the grout back to its natural color.
Fill a spray bottle half way up with water.
Fill the rest of the bottle with white vinegar. Shake the bottle to mix the two ingredients.
Spray down the coffee stains on your grout.
Scrub the stain out with an old toothbrush.
Dampen a cloth with water and wipe down the grout you sprayed with vinegar.