Porcelain tile and grout: deep clean, or restoration.
Porcelain is chosen because it is hard and low-maintenance, and it is. What ages it is what has been left on it: detergent film, traffic soil in the texture, and grout that holds what the mop spreads.
Porcelain is dense and does not absorb much. Its problems are on the surface and in the joints: layers of detergent residue that attract more dirt each cycle, grease and body oils in the texture of matte and anti-slip finishes, hard-water film in the bathroom, and grout that darkens unevenly because it is the porous part of the floor.
The maintenance trap
Many supermarket floor cleaners leave a residue designed to look fresh and smell clean. It builds, it attracts soil, the floor needs cleaning more often and looks worse after each round, and the owner concludes the tile has aged. It has not. Too much detergent in the bucket does the same thing.
What a deep clean involves
Assessment first: the finish (polished, matte, textured, anti-slip), what the soiling is, whether the discolouration is soil, minerals, residue, grout haze or a worn coating, and what is beside the tile, because a stone threshold or a marble skirting changes which products are safe. Then a cleaner matched to the contamination, alkaline for grease and organic build-up, something different for mineral scale, given time to work. Mechanical agitation into the texture and the joints. And extraction, which is the part household tools cannot do: the loosened soil and dirty water lifted off the floor rather than redistributed, so the surface dries clean instead of tacky. Heavy build-up takes more than one pass.
Cleaning versus restoration
Deep cleaning fixes appearance problems that are on the surface. It cannot bring back grout that is permanently stained, cracked or worn away, and it cannot remove scratches, chips or lippage wear on the tile. Those are repair, regrouting, colour sealing or a targeted treatment, and the right diagnosis is what decides it. After a renovation, tenant turnover or a long neglect, construction dust, grout haze, paint specks and adhesive residue need a more technical process than routine cleaning.
Sealing
Porcelain itself is low-porosity and generally does not need sealing. Its grout lines do: a penetrating sealer slows soil and moisture getting in and makes the next clean easier. It does not make grout stain-proof.
What to avoid
Acidic cleaners near any stone trim or fixture. Bleach as a routine product. A stiff brush on polished porcelain, which scratches the glaze. Glossy mop products and over-dosed detergent, which recreate the film. Steam over failed grout or loose tiles.
Afterwards
A neutral, low-residue cleaner at the right dilution, grit vacuumed before mopping, entry mats, spills wiped, and in a commercial space a cleaning schedule set by traffic rather than by the calendar. A café floor and an office lobby wear differently and want different intervals. If the floor still looks dull after a proper clean, it needs a diagnosis, not another product.
On this site
Related questions.
I do not know what kind of stone I have. Does that matter?
Not for getting a quote. Send a photo and we can usually tell, and the difference between marble, limestone and travertine changes the method more than the price. If you want to check yourself: marble is usually veined and takes a high polish; limestone is more uniform and often honed; travertine has visible holes; granite is speckled and much harder; engineered stone is uniform with no natural veining and does not etch. A drop of lemon juice on an inconspicuous spot will etch marble and limestone within minutes and do nothing to granite or engineered stone. Wipe it off straight away either way.
Do you do commercial work, foyers and strata?
Yes, where the job suits the way we work. Foyer floors, reception benches and common-area bathrooms are the same stone and the same method as a home, at larger scale and usually after hours. Strata and building managers get a written scope, a schedule that works around residents, and the insurance certificate before we start.