How to Clean Grout Naturally (And Get It White Again)
by Kay Baker on Oct 09, 2025
Healthy Home How-To
How to Clean Grout Naturally (And Get It White Again)
Transparency note: Educational guidance with practical safety tips. Not medical or professional building advice. Always spot-test in an inconspicuous area first.
Nothing makes a clean bathroom or kitchen look dingy faster than stained, discolored grout. That once-bright grid between your tiles can become a magnet for dirt, mildew, and grime, stubbornly resisting a simple mopping.
Before you reach for a harsh, chlorine-bleach-based grout whitener, take a deep breath. You can restore your grout to its former glory and get it white again using powerful, natural methods that are safer for you and your home.
This guide will walk you through the two most effective natural techniques for deep-cleaning your grout, starting with the gentlest method first.
This is your specific battle plan for tile and grout. For a complete overview on how to clean every floor in your home, check out our Ultimate Guide to Cleaning Floors Naturally.
Method 1: The Everyday Deep Clean (Baking Soda & Water Paste)
This method is perfect for general grime and mild staining. It uses the gentle, non-scratching abrasive power of baking soda to lift dirt out of the porous grout surface.
- Baking soda
- Water
- A small bowl
- A stiff-bristled grout brush (or an old toothbrush)
- A clean cloth
Step-by-Step Instructions
- Create the Paste: In your bowl, mix about ½ cup of baking soda with a few tablespoons of water. Aim for a thick, spreadable paste (think toothpaste).
- Apply to Grout: Spread the paste generously along the grout lines with your finger or a small spatula.
- Let it Sit: Wait 10–15 minutes to let the paste loosen the grime.
- Get Scrubbing: Dip your brush in warm water and scrub in small circles. You’ll see the grime lift into the paste.
- Wipe and Rinse: Wipe away all residue with a clean, damp cloth. Rinse the cloth frequently to avoid redepositing dirt.
Method 2: The Stain-Fighting Power-Up (Hydrogen Peroxide)
If your grout is stained with mildew or heavy discoloration, bring in a whitening boost. 3% hydrogen peroxide is a widely available oxidizer and a gentler alternative to chlorine bleach.
- Baking soda
- Hydrogen peroxide (standard 3% solution)
- A small bowl
- A grout brush
Step-by-Step Instructions
- Create the Peroxide Paste: Mix baking soda with 3% hydrogen peroxide to form a slightly foamy paste.
- Apply and Wait: Apply directly to stained lines and let sit for at least 15 minutes. The bubbling action helps lift deep stains.
- Scrub Vigorously: Work the paste into the grout with your brush.
- Rinse and Dry: Wipe and rinse thoroughly with clean water. Allow grout to dry completely—whitening often looks best once fully dry.
Good to know: 3% hydrogen peroxide can lighten some colored grouts. Spot-test first and avoid prolonged soaking on dark/dyed grout.
Maintaining Your Sparkling Grout
- Seal Your Grout: Most cement-based grout is porous. Apply a quality sealer to create a barrier against moisture and dirt. It’s the single best way to keep grout looking new.
- Increase Ventilation: In bathrooms, run the exhaust fan during and for ~20 minutes after showers to reduce humidity and mildew risk.
- Regular Cleaning: A quick weekly spray and wipe with a pH-neutral cleaner, like Green Llama’s All-Purpose Cleaner, prevents buildup.
Safety & surface notes:
- Always spot-test cleaners on grout and adjacent tile.
- Avoid acids (like vinegar) on natural stone (marble, travertine) and sealed stone.
- Do not mix hydrogen peroxide with vinegar or chlorine bleach.
- Wear gloves if you have sensitive skin and ventilate the area while cleaning.
Keep Grout Clean with Our pH-Neutral All-Purpose Cleaner
FAQs
How often should I deep-clean grout?
High-use, wet areas may need monthly attention; drier areas every 2–3 months. Weekly maintenance cuts down on deep cleans.
Will baking soda scratch my tiles?
Baking soda is a mild abrasive. It’s generally safe for ceramic/porcelain. Avoid aggressive scrubbing on soft, polished stone; when in doubt, spot-test.
Does hydrogen peroxide disinfect?
3% hydrogen peroxide is an oxidizer used in some EPA-registered disinfectants, but home use here is for stain whitening. For disinfection, use an EPA-registered product and follow label contact time.
Trust & Reader Support
- 24-hour correction pledge: If you spot an error, we’ll review and update this article within 24 hours.
- Contact CX: hello@greenllamaclean.com
References (reader-friendly)
- NIH/MedlinePlus & ingredient monographs — basics on household hydrogen peroxide (3%).
- General tile/grout care guidance — manufacturer instructions for grout sealers and maintenance.
- EPA cleaning vs disinfecting basics — why contact time and registered products matter for disinfection.
