How to Whiten Bathroom Grout

Why Bathroom Grout Turns Yellow or Gray

Even if your grout started out bright white, it won't stay that way without regular maintenance. Soap residue, hard water minerals, mold, and everyday dirt all work together to discolor grout over time. The good news: you don't need to re-grout to get it white again. The right cleaning method can restore grout to near-original brightness.

What You'll Need

• Baking soda
• White vinegar or hydrogen peroxide
• Commercial grout cleaner or bleach-based spray
• Grout brush
• Spray bottle
• Rubber gloves
• Microfiber cloths

Method 1: Baking Soda + Hydrogen Peroxide Paste (Best Natural Method)

1. Mix baking soda with hydrogen peroxide to form a thick paste (roughly 2:1 ratio).
2. Apply the paste directly onto discolored grout lines.
3. Let it sit for 10–15 minutes.
4. Scrub firmly with a grout brush.
5. Rinse with clean water and dry with a microfiber cloth.

Method 2: Baking Soda + White Vinegar (Fizzing Action)

1. Sprinkle baking soda along the grout lines.
2. Spray white vinegar over the baking soda using a spray bottle.
3. Allow the fizzing reaction to work for 5–10 minutes.
4. Scrub with a grout brush and rinse thoroughly.

Method 3: Bleach-Based Cleaner (For Stubborn Discoloration)

When natural methods aren't enough, a bleach-based cleaner delivers faster, more dramatic whitening results.

1. Ventilate the bathroom well — open windows and run the exhaust fan.
2. Wear rubber gloves.
3. Apply Scrubbing Bubbles Foaming Bleach Cleaner to the grout lines.
4. Let it sit for 10–15 minutes.
5. Scrub with a grout brush and rinse completely.

Method 4: Commercial Grout Cleaner (Easiest Option)

For a no-fuss approach, Zep Plus Grout Foaming Cleaner cleans and protects grout in one step. Apply, let foam, scrub lightly, and rinse.

How to Keep Grout White After Cleaning

• Apply a grout sealer after every deep clean to lock out moisture and staining agents.
• Wipe down tiles weekly to prevent soap and mineral buildup.
• Run the exhaust fan during every shower.
• Address any discoloration early before it becomes permanent.

Recommended Products

• Zep Plus Grout Foaming Cleaner — cleans and protects in one step
• Scrubbing Bubbles Foaming Bleach Cleaner — powerful whitening for stubborn stains
• Grout Sealer (Clear, Professional Grade) — keeps grout white longer
• Foxtrot Living Grout Brush — hard bristles for effective scrubbing
• It's Just Baking Soda (1.25 lb) — natural whitening agent