Why porcelain floors go grey
Porcelain absorbs almost no water, so dirt rarely soaks into the tile. It sits on it, and it builds up in a few predictable ways:
- Detergent residue. Floor cleaner that is never rinsed off dries as a thin, slightly sticky film. Fresh dirt sticks to it, the next mop adds more cleaner, and the film thickens.
- Dirty mop water. After the first room, a mop spreads diluted dirt evenly across the rest of the floor and into the grout.
- Texture. Matt, stone-look and anti-slip porcelain has a micro-texture that a mop glides over. Soil packs into it, and the floor looks darker in the walkways.
- Sand and hard water. Beach sand is ground in underfoot, and in homes with hard water a mineral film can form where water is left to dry.
- Grout. Cement grout is porous. It takes in dirty water every time the floor is mopped, so the lines go grey first.
Not sure which one you have? Why a porcelain floor looks dirty after mopping walks through the simple checks.
Polished, matt and anti-slip porcelain
| Finish | What usually goes wrong | How we treat it |
|---|---|---|
| Polished / gloss | Streaks, cloudy film, dirt in micro-pores of the polished face | Soft pads, non-abrasive chemistry, careful rinse to finish streak-free |
| Matt / stone-look | Patchy grey walkways, dull appearance | Alkaline pre-treatment, firmer pad to reach the texture, extraction |
| Anti-slip / structured | Dark soil packed into the texture, slippery when greasy | Brush rather than pad so the bristles reach into the texture, longer dwell time |
| Wood-effect planks | Dirt in the printed grain and the many grout lines | Pad plus extra work along the joints |
These are typical starting points. The photos and a small test area on the day decide the final pad and chemistry.
How we clean porcelain
- Dry soil off first. Vacuum the sand and grit so it is not dragged around under the pad.
- Test. A small area to check the chemistry and pad on your finish.
- Pre-treat. Apply the cleaning solution and leave it long enough to break down residue and soil.
- Machine scrub. A low-speed rotary machine works the surface evenly. That is the difference from a mop: steady pressure and agitation across every tile and grout line.
- Edges and corners. Skirting lines, door thresholds and around kitchen units by hand.
- Extract and rinse. Wet-vacuum the dirty solution, rinse with clean water and extract again, so no residue is left to attract new dirt.
More detail on the machine, pads and chemistry: tile and grout deep cleaning.
What cleaning can’t fix
- Scratches in polished porcelain. Cleaning removes dirt, not damage.
- Chipped edges, cracked tiles and hollow-sounding tiles.
- Grout that is stained right through or breaking up. That needs regrouting or a grout colour treatment, which is a different trade.
- Haze that is part of the tile’s factory finish.
If your photos show any of these, we say so before you book.
Price
€15 per m², flat, grout lines included. If the floor needs an extra pass it is +€2/m² for very dirty floors and +€5/m² for extremely dirty, heavy-use floors. Minimum job 50 m² (€750). A 120 m² villa floor at the base rate is €1,800.
Porcelain cleaning questions
Can you clean polished porcelain without dulling it?
Yes. Polished porcelain gets soft pads and non-abrasive chemistry. We do not grind or polish the surface; the aim is to remove what sits on it. Existing scratches stay.
Will anti-slip porcelain still be anti-slip afterwards?
Yes. Cleaning removes the dirt packed into the texture; it doesn’t smooth the tile. A clean anti-slip tile often grips better than a dirty one.
My porcelain is new and has a haze on it. Can you help?
Often, yes. Haze left after tiling is usually cement or grout residue and needs a different chemistry from everyday dirt. Mention that the floor is new and send photos.
Do you seal porcelain?
Most porcelain is dense and does not need sealing. We clean; if your grout would benefit from a sealer afterwards, we tell you.
Booking for a villa, apartment or holiday let? See villa and apartment floor cleaning for timing, furniture and access.
New floor with a haze on it? That is an after-builders floor clean. Porcelain outside too? See terrace and patio tile cleaning.
Also see: ceramic floor cleaning · how to remove grey film from porcelain · how to clean porcelain grout · areas we cover