To deep clean grout, mix equal parts baking soda and vinegar, apply it to the grout lines, scrub with a brush, then rinse with warm water for a fresh look.
Dirty grout can make even the cleanest tile floors look dingy. Over time, grout absorbs stains, dirt, and grime that regular mopping can’t remove. With the right techniques and products, you can restore your grout to its original bright condition.
Why Grout Gets Dirty So Easily
Grout is porous by nature. This means it absorbs liquids and traps dirt particles deep within its surface. Common causes of grout discoloration include:
- Dirt and dust accumulation
- Mold and mildew growth
- Food and beverage spills
- Hard water deposits
- Soap scum buildup
For heavily soiled grout, check out our best methods for deep cleaning tile grout for professional-grade results.
Effective Grout Cleaning Solutions
Baking Soda and Vinegar
This classic combo creates a powerful fizzing action that lifts dirt from grout lines:
- Make a paste with baking soda and water
- Apply to grout lines with a toothbrush
- Spray with vinegar and let bubble for 5 minutes
- Scrub with a stiff brush
- Rinse thoroughly
Hydrogen Peroxide Solution
For mold and mildew, mix equal parts hydrogen peroxide and water. Apply with a spray bottle, let sit 10 minutes, then scrub.
Oxygen Bleach
Safer than chlorine bleach, oxygen bleach brightens without harsh fumes. Mix with warm water according to package directions.
Essential Cleaning Tools
| Tool | Best For |
|---|---|
| Stiff-bristle brush | Heavy scrubbing |
| Toothbrush | Precision cleaning |
| Grout brush | Angled for grout lines |
| Steam cleaner | Deep sanitization |
For tough jobs, consider using a steam mop designed for tile floors to sanitize without chemicals.
Step-by-Step Deep Cleaning Process
Preparation
Sweep or vacuum the floor to remove loose dirt. Protect surrounding surfaces from cleaning solutions.
Application
Apply your chosen cleaner to grout lines. For best results, work in small sections (3×3 feet).
Dwell Time
Let the cleaner sit for 5-15 minutes to penetrate and loosen grime. Don’t let it dry completely.
Scrubbing Technique
Use a back-and-forth motion along the grout line. Apply firm pressure but avoid damaging the grout.
Rinsing
Remove all cleaner residue with clean water. Change rinse water frequently.
Drying
Dry the area completely with clean towels to prevent water spots and new stains.
When To Consider Grout Coloring Products
If cleaning doesn’t restore your grout’s appearance, coloring products like Polyblend Grout Renew can provide a fresh look. These products:
- Cover stains permanently
- Come in various colors
- Create a protective barrier
- Last 1-2 years with proper care
Preventing Future Grout Stains
Keep grout looking fresh longer with these maintenance tips:
- Seal grout every 6-12 months
- Wipe up spills immediately
- Use pH-neutral cleaners
- Dry floors after cleaning
- Consider maintenance techniques used for other hard surfaces
For severe cases where grout can’t be cleaned, replacement may be necessary. New grout with proper sealing will resist stains better.