Grout is available in a variety of colours with white being the most common. Located between tiles, grout can quickly become dingy and stained with a build-up of dirt, grime, mould and mildew. Over time, these factors will cause your white grout to lose its bright colour. The dirty white grout can make the whole room appear dull. Fortunately, you can remove the stains and fungus and restore the look of your grout.
Pour one gallon of water in a bucket. Add a cup of oxygen bleach and stir with a spoon until dissolved.
Pour the mixture gently into a spray bottle. Mist the dingy white grout with the mixture and let sit for 10 minutes.
Scrub the grout with an old toothbrush while adding more of the mixture, if necessary.
Add 2 cups of oxygen bleach to a gallon of water for tougher to remove grout stains. Saturate the grout with the mixture and let soak for 30 minutes. Apply more mixture to the grout and scrub with a toothbrush.
Wipe the tiles and grout clean with a cloth dampened in cool water. Let the tiles and the grout air dry.