- 1). Mix a solution of oxygen bleach and water into a bucket. The exact ratio of oxygen bleach to water may vary depending on the product you are using. The higher the concentration of sodium percarbonate (the active ingredient in oxygen bleach) the less bleach you will use. Generally, use between two and four tbsp. of oxygen bleach per two cups of water. Stir the water and oxygen bleach with a large spoon until the powder is completely dissolved.
- 2). Dip a measuring cup with a lip into the bucket to scoop out some of the oxygen bleach solution. Pour the oxygen bleach solution directly onto the grout. Apply the solution only to a small section at a time; about an arm's length square is ideal. A turkey baster or eyedropper will also work for applying the oxygen bleach to the grout.
- 3). Spread the mixture into the grout using a grout brush. If you do not have a grout brush, a small paintbrush will suffice. Allow the oxygen bleach to sit on the grout for a minimum of five minutes. To minimize the amount of scrubbing you will have to do later, leave the mixture on the grout for up to 30 minutes, adding more of the solution if it begins to dry.
- 4). Scrub the grout briskly with a grout brush. If you do not have a grout brush, use an old toothbrush.
- 5). Fill a bucket with plain water. Mop the entire tiled surface to remove dirty water and residue from the floor. Allow the floor to air dry.
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