Scrub dirty grout using plain warm water and a stiff-bristled brush. … Spray with equal parts vinegar and warm water for several minutes. … Apply a baking soda paste and spray with vinegar. … Pour on some hydrogen peroxide. … Apply oxygen bleach for up to 15 minutes. … Try a commercial product.

How do you clean large area of tile grout?

1. Mix 1 gallon warm water, 1 cup white vinegar and 1/2 cup baking soda in a bucket.
2. Dip your nylon scrub brush into the mixture and scrub over the grout in large circular scrubbing motions. …
3. Discard the cleaning solution from the bucket, and refill the bucket with plain warm water.

How do you clean wide grout?

1. Mix up a solution of about 3 tablespoons powdered oxygen bleach (something like OxiClean would work) and warm water in a 2-gallon bucket.
2. With a sponge or cloth, swipe it around the surface until the grout lines are full.
3. Let it soak in for at least 15 minutes, then rinse well with clean water.