Why is my grout staining my tile?

Author: Kenton Greenholt  |  Last update: Sunday, July 27, 2025

MAINTAINING YOUR TILE'S GROUT Most grout is made of sand and is porous, therefore things like dirt, debris, soap scum, and water get ground into the grout. All this can lead to the growth of bacteria, mold, and mildew, which is why your grout looks stained.

How to stop grout staining tiles?

Use A Sealant To Protect Your Tile Grout

One way to help protect tile and grout from deterioration is to apply a sealant. Grout sealers form a barrier on the surface of the tile and grout, repelling water, stains, and dirt. They can also help to prevent mildew and bacteria.

Why did the grout stain my tile?

It's either Improper (dry) mixing of the grout or improper sponging/washing right after it was grouted. It does matter how much time you wait, how many times or which direction you are wiping off the grout.

How do you fix stained grout?

To begin, combine 4 tablespoons of baking soda, white vinegar, and ammonia with 1 ½ quarts of warm water. Spray this solution onto the stained grout and allow to sit for about 15-20 minutes. Wipe clean and repeat as necessary. This solution can be used on both light and dark colored grouts.

How to remove grout stains from tile?

Start by combining four parts water and one part white vinegar (hint: add more vinegar to increase the cleaner's strength). Pour into a bucket or spray bottle and apply the water and vinegar mixture to the tile surface. Scrub the area using a cloth, nylon pad, or a mop.

This Grouting Mistake will Ruin Your Tile Job

Is grout stain permanent?

Grout stain will fade over time, especially if the tile is in a high-traffic area. But with a good application of a quality product, it should last for up to 15 years.

Does vinegar remove grout stains?

The best homemade grout cleaner is a mix of baking soda and vinegar. This solution is effective for most grout cleaning needs and is safe for regular use.

How to fix grout discoloration?

For more severe discoloration, you may need to use a specialized grout cleaner or a mixture of baking soda and water. Be cautious when using stronger cleaning products, as they can damage the grout or tiles if used improperly.

What do professionals use to clean grout?

Some professionals swear by a simple mixture of baking soda and peroxide to clean grout. Hydrogen peroxide is an acid, and baking soda is a base compound. Mixing the two together creates a reaction that can penetrate the grout lines and free dirt and debris.

Can you grout over stained grout?

In some cases, you might be able to regrout over your existing grout. Doing it yourself might even be an option if you have some basic home repair skills. The big advantage of regrouting over old grout is that it can save you a great deal of time and money.

What causes brown stains on tile grout?

Damp showers produce brown grout even more than other areas

You might notice that your grout turns brown much quicker in your shower than any other area of your home. This could mean that mold spores and mildew are setting up deep within your grout.

Why does my tile grout always look dirty?

If dirt and grime are simply coating the surface of your grout, simply sweep and damp mop to remove the discolorations. If the grout lines still look dark, it is because the pores in the grout are filling up with contaminants again, and those contaminants have seeped down below the surface.

Do grout pens work?

This really works! The grouting around the tiles in our kitchen and bathroom was looking very tried with several black damp spots. The grout pen covered it all in one coat and was very simple and quick to use. We added an extra coat on the very stained sections and now it all looks like fresh grouting.

Why does my grout keep staining?

Most grout is made of sand and is porous, therefore things like dirt, debris, soap scum, and water get ground into the grout. All this can lead to the growth of bacteria, mold, and mildew, which is why your grout looks stained. Even if you seal your grout, that can wear down over time.

How do you seal grout so it doesn't stain?

Here are some tips on how to ward off those unsightly stains through grout sealing.
  1. Step 1: Make sure the grout is dry. All new grout should be allowed to cure fully before being sealed. ...
  2. Step 2: Apply the sealer. ...
  3. Step 3: Wait 10 minutes. ...
  4. Step 4: Test with water. ...
  5. Step 5: Reapply if necessary.

How do you make grout stain resistant?

Acidic cleaners, shampoos, lotions and soap scum cause stains and discoloration. If you have been ignoring your grout all this while, be mindful that it could be a hoarder of germs and mold. To ensure a shower grout stain resistant, you need to seal it with an epoxy grout sealer.

What should you not use to clean grout?

Chemical cleaners, such as, Tilex, Soft Scrub, Scrubbing Bubbles, or ammonia products will nearly always result in your tile surfaces' grout becoming very discolored.

Will hydrogen peroxide damage grout on tile?

Yes, hydrogen peroxide is a natural neutral cleaner that is safe to use on grout. Hydrogen peroxide and baking soda produce oxygenated bleach, which is highly effective for cleaning grout.

How do you fix badly stained grout?

Hydrogen Peroxide and Baking Soda
  1. Combine the hydrogen peroxide and baking soda and form a paste.
  2. Apply the paste to the stained or yellowed grout area.
  3. Let it sit for at least 5 minutes.
  4. Scrub with a grout brush.
  5. Rinse with water.
  6. Repeat as needed.

What causes grout to change color?

The simple answer is, most likely, a combination of moisture, dirt, grime and dust. While you may think you're cleaning your tile by mopping it or using a Swiffer on it, you are actually pushing the existing dirt, dust, and grime down into the pores of your grout. Your grout, by nature, is highly porous.

Does the pink stuff clean grout?

How it works: Touted as a miracle cleaning paste, The Pink Stuff is easy to apply to grout using a soft cloth or sponge. Simply rub and scrub, and then rinse with hot water. As a mildly abrasive cleaner, the paste has a little grit to it, which helps scrub away dirt and debris from grout and surfaces.

Can grout be permanently stained?

Permanence: Staining grout is permanent, so you want to ensure you're satisfied with your color choice first. Preparation and Maintenance: Proper surface preparation and maintenance are crucial for a successful outcome. Requires Expertise: It's typically a job that requires the help of a professional or skilled person.

What happens if you wait too long to wipe grout?

As go-to grout and tile care specialists, The Grout Medic truly wants what is best for your tile. Waiting too long to wipe grout could result in unsightly grout haze. Don't wait too long to wipe off grout!

Does OxiClean remove grout stains?

Whether you're someone who regularly cleans the bathroom or saves deep cleaning tile grout for spring cleaning, OxiClean™ bathroom cleaners can help remove grout stains on vertical and floor tiles, plus more.

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