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Tile Grout Dirty or Yellow? Whiten It and Keep It White

Grout is porous, so dirt, soap and damp sink in and stain it. Scrub it white with a paste and a stiff brush, then seal it so the color stays.

By Jamilur Rahman Updated November 5, 2026 · 7 min read

Time
45 min plus drying
Cost
Under $20
Difficulty
Easy
Close-up of tile grout lines, half stained yellow-grey and half scrubbed white, with a stiff narrow brush lying on the tile
In this guide
  1. Quick answer
  2. Free vs. permanent fix
  3. What you'll need
  4. Why it happens
  5. Try this first (free)
  6. When free fixes aren't enough
  7. Buy the fix
  8. How to keep tile grout clean in the shower and stop floor tile grout getting dirty
  9. How to keep bathroom tiles and grout clean, shiny, white and fresh
  10. What to skip
  11. FAQ
  12. Related problems

Quick answer

How to keep tile grout white: scrub off the dirt with a baking soda paste or an oxygen-based grout cleaner and a stiff grout brush, then seal the grout and wipe it dry after use. The paste works for light staining. A proper cleaner and brush cut the work, and sealing is what stops it going yellow again.

Free fix vs. permanent fix

Free fix · 45 minutes

Baking soda and peroxide paste

  • Mix baking soda with 3% hydrogen peroxide into a thick paste
  • Spread it along the grout and leave it 10 to 15 minutes
  • Scrub with an old toothbrush, then rinse and dry
  • Never mix peroxide with vinegar or bleach

How long it lasts: Brightens light staining. Unsealed grout soaks up new dirt and soap within weeks, so it can dull again.

Most readers choose Permanent fix
Grout cleaner with a stiff grout brush (illustration)
Illustration

Grout cleaner with a stiff grout brush, then a sealer

A cleaner made for grout lifts deep stains, and a narrow stiff brush gets into the lines that a toothbrush skips. Sealing afterward fills the pores, so water and dirt wipe off instead of soaking in. Cleaning alone just returns grout to a stainable state.

What to get: Grout cleaner with a stiff grout brush

How long it lasts: Months to a year or more once sealed, depending on how wet the area is.

Check price on Amazon

As an Amazon Associate I earn from qualifying purchases.

What you'll need

  • Baking soda

    The base of the free paste

    You have it

  • 3% hydrogen peroxide

    Whitens as it sits. Keep it away from vinegar

    You have it

  • Old toothbrush

    Fine for a few lines, slow for a whole floor

    Free

  • Rubber gloves

    Protect your hands from cleaner

    You have it
  • Our pick
    Grout cleaner with a stiff grout brush (illustration)
    Illustration

    Grout cleaner with a stiff grout brush

    Faster and deeper than a toothbrush on old stains

    Check price
  • Penetrating grout sealer (illustration)
    Illustration

    Penetrating grout sealer

    Applied after the grout is cleaned and fully dry

    Check price

Why it happens

1

Grout is porous

Cement-based grout is full of tiny pores. Water carries soap, skin oil, mineral deposits and dirt into them, where a quick wipe cannot reach. That is what turns white grout grey or yellow.

2

Soap scum and mildew

In showers, soap scum feeds mildew, which stains grout grey, brown or pink. A bathroom that stays damp after a shower makes it worse.

3

Cleaner residue and the wrong products

Some cleaners and acidic products leave a film that turns yellow, or etch the grout surface so it holds dirt more easily. Colored and pigmented sealers can also yellow with age.

4

Floor traffic

On floors, shoes grind grit into the lines. Mop water full of dirt does the same, so grout gets darker the more you mop with a dirty mop.

Try this first (free)

Do these in order, starting with the simplest.

  1. Vacuum or sweep first

    Loose grit makes scrubbing less effective and scratches tile. Wipe the area with a damp cloth.

  2. Make and spread the paste

    Tool used: Baking soda

    Stir about 3 tablespoons of baking soda with 1 tablespoon of 3% hydrogen peroxide until it is thick like toothpaste. Spread it along the grout lines and leave it for 10 to 15 minutes.

  3. Scrub the lines

    Tool used: Grout cleaner with a stiff grout brush

    Work the brush back and forth along each line with firm pressure. A narrow stiff grout brush gets into the line where a toothbrush rides over it. Wear gloves.

    Grout cleaner with a stiff grout brush (illustration)
    Illustration

    Tool for this step

    Grout cleaner with a stiff grout brush · Faster and deeper than a toothbrush on old stains

    Check price on Amazon

  4. Rinse and dry

    Wipe with a damp cloth and clean water until the paste is gone, then dry the area with a towel. Let the grout dry completely before the next step.

  5. Seal it and keep it dry

    Tool used: Penetrating grout sealer

    Once the grout has dried for 24 hours, apply a penetrating sealer with the applicator and wipe the excess off the tile. Then wipe or squeegee wet areas and run the fan after showers.

    Penetrating grout sealer (illustration)
    Illustration

    Tool for this step

    Penetrating grout sealer · Applied after the grout is cleaned and fully dry

    Check price on Amazon

When free fixes aren't enough

If the paste lightens the grout but the stains return within weeks, the grout is unsealed and soaking up moisture again. A grout cleaner with a stiff brush lifts deep stains faster, and a sealer stops them coming back. If the grout is crumbling, cracked or sunken, cleaning will not fix it and it needs regrouting. Widespread black mold on the wall, not just in the lines, means a moisture problem that needs attention.

Buy the fix

Still stuck after the free fixes? These are the products we would look at.

Our picks compared
PickProductFixesWho it's forBuy
Best pick
Grout cleaner with a stiff grout brush (illustration)
Illustration
Grout cleaner with a stiff grout brush
deep dirt, soap scum and yellowing in the grout Anyone with a whole bathroom or floor of grout to clean, or grout that stays stained after a paste. Check price
Budget pick
Stiff grout brush (illustration)
Illustration
Stiff grout brush
slow scrubbing with a toothbrush People who will use their own paste and only need a better brush. Check price
Upgrade pick
Penetrating grout sealer (illustration)
Illustration
Penetrating grout sealer
grout that soaks up water and stains again People who just cleaned the grout and want it to stay white longer. Check price
Best pick
Grout cleaner with a stiff grout brush (illustration)
Illustration

Grout cleaner with a stiff grout brush

Fixes: deep dirt, soap scum and yellowing in the grout

Look for: Oxygen-based or non-acid formula; Narrow stiff bristles that fit the grout lines; A comfortable handle, so you can scrub for 20 minutes; Safe for your tile type, so check natural stone.

Who it's for
Anyone with a whole bathroom or floor of grout to clean, or grout that stays stained after a paste.
Honest downside
You have natural stone tile like marble. Check the label first, since acids etch stone.
Check price on Amazon
Budget pick
Stiff grout brush (illustration)
Illustration

Stiff grout brush

Fixes: slow scrubbing with a toothbrush

Look for: Stiff nylon bristles, not metal; A narrow tip that fits grout lines; A long handle for floor work.

Who it's for
People who will use their own paste and only need a better brush.
Honest downside
You want the cleaner too. The best pick includes both.
Check price on Amazon
Upgrade pick
Penetrating grout sealer (illustration)
Illustration

Penetrating grout sealer

Fixes: grout that soaks up water and stains again

Look for: A penetrating, not a surface, sealer; A narrow applicator or brush tip; Suitable for the room: shower, floor or kitchen; A clear cure time on the label.

Who it's for
People who just cleaned the grout and want it to stay white longer.
Honest downside
Your grout is cracked or still wet. Repair and dry it first.
Check price on Amazon

As an Amazon Associate I earn from qualifying purchases. We don't show prices because they change, so use the button to see today's price.

How we picked: How we picked: this page is based on tile and grout care guides from tile and sealer makers, cleaner label instructions, and what owners report about stained grout. We do not test products by hand.

How to keep tile grout clean in the shower and stop floor tile grout getting dirty

To stop tile grout getting dirty, stop dirt and water sitting in the lines. For shower grout, squeegee or wipe the wet tile after use, run the fan and keep soap off the grout. For floor tile grout, sweep or vacuum often, use a clean mop and fresh water, and wipe up spills quickly. Seal both once clean.

How to keep bathroom tiles and grout clean, shiny, white and fresh

To keep bathroom tiles clean and shiny, wipe them dry after showers and use a mild cleaner that rinses away without leaving a film. To keep them white, scrub the grout every month or two before stains set. To freshen up bathroom tiles, rinse well, let the room dry with the fan and window open, and use a squeegee on glass-smooth tile.

What to skip

Chlorine bleach and acidic cleaners

Bleach whitens at first but can discolor colored grout and gives off gas if it meets vinegar or ammonia. Acid-based cleaners and strong vinegar can etch grout and stone, making grout rougher and dirtier within weeks.

Frequently asked questions

Why is my tile grout turning yellow?
Common causes are soap scum, hard water minerals, cleaner residue and moisture that stays in the grout. A sealer that has aged can also yellow. A scrub with a grout cleaner removes most of it.
How to stop tile grout going yellow?
Seal clean, dry grout, wipe wet tile after use and rinse cleaner off thoroughly. Most yellowing comes back because the grout is still soaking up residue and damp.
Does baking soda whiten grout?
Baking soda is a mild abrasive that lifts light dirt, and peroxide helps brighten it. Both work best on light staining. Old, deep stains need a grout cleaner and a stiff brush.
How often should I reseal grout?
It depends on the sealer and how wet the room is. A simple check: if water dropped on the grout darkens it within a minute or so, it is time to reseal. Follow the label.

As an Amazon Associate I earn from qualifying purchases. Affiliate disclosure

Grout cleaner with a stiff grout brush (illustration)
Illustration

Our pick: Grout cleaner with a stiff grout brush

Check price