Why grout gets dirty (and why mopping makes it worse)
Tile is mostly non-porous. Grout isn’t. It sits a little lower than the tile, so mop water runs into the lines and leaves its dirt there as it dries. Add soap residue, kitchen grease and hard-water minerals, and the grout slowly darkens from the top down. Bleach can lighten the color for a while, but it doesn’t remove the dirt, and it can damage colored grout. More on that in why grout turns gray.
What we clean
- Kitchen floorsIncluding the grease lane by the stove.
- BacksplashesCeramic, glass and subway tile.
- Showers & tub surroundsWalls, floors and benches.
- Bathroom floorsLarge format, hex and mosaic.
- Entryways & hallsPorcelain, travertine, marble.
- Laundry & mud roomsThe floors that take the real dirt.
How we clean tile and grout
- Inspect. Tile type, grout condition, any old sealer or coating, and anything cracked or loose.
- Dry soil first. Sweep and vacuum grit so it doesn’t turn into a paste.
- Apply the right cleaner. Alkaline cleaners for ceramic and porcelain; pH-neutral, stone-safe products for marble, travertine and limestone.
- Let it work. Dwell time does a lot of the heavy lifting, which means less aggressive scrubbing.
- Scrub every grout line. Machine brushing on open floor, hand detail brushes on edges, corners and showers.
- Hot-water rinse and extraction. We rinse and pull the dirty water back up, so it doesn’t dry back into the grout.
- Dry, inspect, seal (optional). A penetrating sealer slows down future staining once the grout is clean and dry.
Different tile, different rules
Ceramic and porcelain
The most forgiving tile. It handles stronger cleaners and more agitation, so this is where grout usually comes back the brightest.
Marble, travertine and limestone
These are calcium-based and react with acids, including vinegar, many “bathroom” cleaners and acidic grout cleaners. We use stone-safe chemistry only. Dull etch marks are surface damage, not dirt, and need a stone polisher rather than a cleaner.
Saltillo and terracotta
Common in Spanish-style LA homes. Very porous and usually sealed or waxed, so we test before cleaning and go gently.
Vintage tile
1920s hex floors and old glazed wall tile are worth saving, and old grout can be soft. Lower pressure, neutral cleaners, and an honest word if a section needs a tile setter.
About sealing
A penetrating sealer soaks into the grout and makes it resist stains and water. It doesn’t make grout waterproof, and it doesn’t last forever: plan on resealing every 1 to 3 years, sooner in showers. It’s optional, but it’s the single best way to keep the result you paid for.
What cleaning can’t fix
Cracked or missing grout is a regrouting job. Bleach-damaged or permanently stained grout may need a colorant. Mold behind the tile or soft, spongy spots in a shower floor are signs of a moisture problem a cleaner can’t solve. If we see any of these, we’ll tell you.
