Why grout goes dark.
Tile is hard and smooth; grout isn’t. It’s porous, so it soaks up whatever lands on it — spills, mop water, the grime tracked in at the door — and holds moisture. In kitchens and bathrooms that means bacteria, and mildew: the white or grey patches that show up along bathroom grout lines.
Dust and allergens settle into the lines too, and don’t stay there: they get kicked back into the air you breathe.
Dirt and grime
Tracked in, mopped into the lines, packed down over time.
Mildew
White or grey patches where moisture sits — bathroom floors most of all.
Bacteria
Most of all in kitchens and bathrooms.
Dust and allergens
Settle in the lines and get stirred back into the air.
Why scrubbing doesn’t bring it back.
A grout brush and a store cleaner work on the surface. What makes grout dark is below it, in the pores.
Professional equipment reaches down into the lines and removes what it loosens instead of leaving it behind. Done regularly, it keeps dirt from breaking the grout down, which can save you from regrouting later.
What you get
- Truck-mounted equipmentA deeper clean than handheld or DIY tools can manage.
- Trained techniciansHeavy stains and grime taken on without damaging the tile.
- Eco-friendly solutionsTough on dirt, safe around kids and pets.
- Tile floorsKitchens, bathrooms and entryways.
How we clean tile and grout.
Look and quote
We see the floors you want cleaned, spot the problem areas, and give you a price. The estimate is free.
Clean with truck-mounted equipment
A rotary tool powered from the truck works over the tile and down into the grout lines, loosening and removing the dirt, bacteria and allergens packed into them — with eco-friendly solutions that are safe around kids and pets.
Walk it with you
A final walkthrough of the finished floors before we leave, so you see the result for yourself.
Keeps coming back?
Mildew cleans off. A leak doesn’t.
What it costs.
There’s no flat price: a powder-room floor and a kitchen, hallway and two bathrooms aren’t the same job.
Free estimate. The price you’re quoted is the price you pay.
How much tile
Priced by the square footage of floor you want cleaned.
Which rooms
A single bathroom, or the kitchen, entryway and baths together — more rooms, more floor and more grout lines.
How dirty the grout is
A light refresh goes quickly; years of ground-in grime take more passes to lift.
The rest of the floor.
Tile is one surface where dust and allergens collect. The carpet and the ductwork are the others.
Before you book.
Longer answers to the questions people ask before they call.
Why Tile and Grout Cleaning Matters
Learn why tile and grout cleaning matters for your health. K.O.S. Cleaning offers top rated cleaning services on Long Island. Free estimates.
Read the guide →
Is That Smell Mold, Mildew, or Something Worse?
Noticing a musty odor in your Long Island home? Learn how to tell if it’s mold, mildew, or something worse—and what to do next.
Read the guide →
Frequently asked questions
Straight answers on methods, timing and cost.
What's the best way to clean tile and grout?
For everyday upkeep, sweep and mop. But grout is porous: dirt, bacteria and mildew settle below the surface, where a mop and a scrub brush don't reach. Professional truck-mounted equipment cleans down into the grout lines and takes away what it loosens.
How do I get my grout white again?
Dark grout is usually dirt and grime packed into the pores, and sometimes mildew in bathrooms. A deep professional cleaning removes it. If the grout stays dark after cleaning, or the dark patches keep coming back in the same spot, that points to moisture, not dirt.
How often does grout need cleaning?
It depends on traffic and moisture. Kitchens, bathrooms and entryways get dirty fastest. When the grout lines look noticeably darker than the tile, or dark patches keep coming back in the bathroom, it's time.
What tile do you clean?
Tile floors — kitchens, bathrooms and entryways.
Is it worth paying a professional?
If scrubbing hasn't brought the grout back, yes. It also protects the grout: regular cleaning stops dirt from breaking it down, which can save you from regrouting later.
Will it damage my tile?
No. Our technicians are trained to take on heavy stains and grime without damaging the tile.
Is it safe for kids and pets?
Yes. We use eco-friendly cleaning solutions that are tough on dirt but safe for your family and pets.
How much does tile and grout cleaning cost?
It depends on how much tile there is, where it is, and how dirty the grout is. The estimate is free, and the price you're quoted is the price — no hidden fees.
Get a free tile & grout quote.
Real person · free estimates · no obligation
Call for a quote(631) 560-8999