If regular bleach lightening won t work the best option that you can pursue is to change the color of your grout by taping off the tile cleaning your grout and applying some grout colorant.
Brighten tile grout.
Your patience and thoroughness will be fully rewarded because the tile grout will become white as snow.
We all deal with dirty grout on our tiles but their is an easy way to whiten it to make a big impact.
Work in small sections you need to wipe the grout renew off the tile before it dries.
Repeat over entire tiled surface.
Clean tiled surface and let dry.
If there are mildew stains on the grout spray them with equal parts water and white vinegar and let the mixture sit for 5 minutes.
After you clean the joints and if they are white whiten them better.
To whiten grout start by spreading a baking soda and water paste on the grout.
Wipe or rinse the surface with a lint free cloth to remove any remaining cleaner.
Using a tile brush add a thin layer to grout and work in sections.
Though it s not wise to try to lighten this grout with bleach you do have two other methods you can use to change the color of your grout.
Depending on the size of the surface you are working on will determine how long the whole process will take.
Wipe clean with the chamois.
When you wipe the tile 90 of the grout renew will stay on the grout.
To do this put your gloves on soak a piece of cotton wool in hydrogen peroxide and clean the tile grout.
It s an easy inexpensive four step process.
Sponge on the pretreat solution and let it sit for five minutes.
Have a bunch of clean dry rags on hand to wipe the grout renew off the tile.
Shake bottle well and remove cap.
How to whiten tile grout.
Then scrub the grout with the supplied brush.
Grout is incredibly porous like a giant sponge which means it will absorb any grease grime oils or spills it comes into contact with says leslie reichert green cleaning coach and author of the joy of cleaning and while the culprit may vary from room to room mildew in the bathroom cooking.
How to whiten tile grout the easy way.
If your tile grout is dirty and stained but still sound consider whitening the grimy grout with colorant.
Stained grout detracts.
Then use a stiff bristled brush to scrub the paste into the grout before rinsing it off with warm water.
Again you can see how i do this in the how to whiten tile grout video link above if it s confusing.
Press sponge tip up and down along grout line to apply the product.
With tile the difference between dingy and dazzling often comes down to the grout in between.