What's actually causing this
Grout gets stained and discolored because it's porous and absorbs soap scum, mold, mildew, and mineral deposits. Unsealed grout absorbs stains much faster.
What you'll need
Links go to Amazon search results — buy the part that matches your specific model. Uncle AI earns a small commission on purchases, at no extra cost to you.
- Grout cleaning brush Shop →
- Hydrogen peroxide Shop →
- Baking soda Shop →
- Grout sealer Shop →
- Spray bottle Shop →
Step-by-step fix
-
1
Make a cleaning paste
Mix baking soda with just enough hydrogen peroxide to form a thick paste. Apply it directly to the grout lines. Let it sit for 5–10 minutes before scrubbing.
-
2
Scrub the grout
Use a stiff-bristled grout brush or an old toothbrush. Scrub in small circular motions along each grout line. For floor grout, a drill attachment brush saves significant time.
-
3
Rinse thoroughly
Wipe away the paste and residue with a damp cloth, then rinse with clean water. Leftover baking soda residue will leave a white haze if not fully rinsed.
-
4
Tackle mold with targeted cleaner
For black mold in shower grout, spray undiluted white vinegar or a tile and grout mold spray. Let it sit 15 minutes before scrubbing. For persistent mold, oxygen bleach (not chlorine bleach) works on most grout types.
-
5
Seal the grout
Once the grout is clean and fully dry (wait 24 hours), apply a penetrating grout sealer with an applicator brush. This fills the pores and makes the grout water-resistant. Re-seal once a year in high-traffic areas.
Professional cleaning services in Miami typically charge $200–600 for a standard home cleaning. Pressure washing runs $300–1,200 depending on surface area.
Dust and sun exposure in Miami mean exterior surfaces need more frequent cleaning. UV also fades interior fabrics near windows.
Regular cleaning and maintenance frequency varies by Miami's climate and conditions.
DIY in Miami: Miami's strict Florida licensing requirements, hurricane codes, and environmental hazards make DIY repairs very restricted. Homeowners should hire licensed professionals for plumbing, electrical, and HVAC. Coastal properties require special knowledge and materials.
- Grout is cracking, crumbling, or missing in sections — needs regrouting.
- Mold keeps coming back within days despite cleaning — may indicate moisture behind the tile.
- Tile itself is cracked or loose — a deeper substrate issue.
Let Uncle AI diagnose it first.
Describe the problem. Uncle AI asks the right questions and tells you exactly what's broken — and whether you should fix it yourself or call someone in Miami.
Start free diagnosis →