Knowing how to clean grout without destroying it makes the difference between tiles that look fresh and grout that looks worse after cleaning. Dirty grout makes even clean tile look grimy — but using the wrong cleaner can damage it or strip its sealer. Here’s how to get it clean the right way.

Start With the Gentlest Option

Before reaching for heavy chemicals, try warm water and a stiff-bristled brush first. A lot of surface dirt comes up with just that. Use a grout brush or an old toothbrush — the key is getting into the grout line directly rather than scrubbing across the tile. Work in small sections and rinse as you go.

The Baking Soda and Vinegar Method

For more stubborn grime, make a paste of baking soda and water, apply it to the grout lines, then spray with white vinegar. It’ll fizz — that’s fine, it’s just a chemical reaction that helps lift dirt. Let it sit for a few minutes, then scrub and rinse. This is effective for light to moderate staining and won’t damage sealed grout.

Important — Don’t Use Vinegar on Natural Stone

If your tile is marble, travertine, limestone, or any natural stone, skip the vinegar entirely. Acid etches stone and causes permanent dull spots. Stick to pH-neutral cleaners or products specifically labeled safe for natural stone. When in doubt, check what your tile is made of before applying anything.

For Really Stubborn Stains — Oxygen Bleach

Oxygen bleach (like OxiClean) is much gentler than chlorine bleach but very effective on deep grime and mildew. Mix it with warm water into a paste, apply to the grout, let it sit for 15-30 minutes, then scrub and rinse thoroughly. It’s safe for colored grout, unlike chlorine bleach which can fade it.

When to Use Chlorine Bleach

Chlorine bleach is powerful but should be a last resort for white or light grout only. Apply it carefully with a small brush directly to the grout line, avoid getting it on colored tile or colored grout, let it sit no more than 10 minutes, then rinse very well. Always ventilate the room — the fumes build up quickly in small bathrooms.

Seal It When You’re Done

Clean grout is a great time to apply a grout sealer. Sealer goes on with a small brush or applicator pen, dries in an hour, and makes future cleaning dramatically easier by preventing stains from soaking in. A bottle runs about $10 and covers a typical bathroom. Reapply every 1-2 years.

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