Marble Floors: Cleaning, Polishing or Crystallising? What Your Floor Actually Needs

It dissolves in acid

Marble is made mostly of calcite, a form of calcium carbonate. That is the same mineral as the limescale in a kettle. Anything that dissolves limescale dissolves marble as well: vinegar, lemon juice, cola, tomato sauce, wine and, above all, bathroom descalers and toilet cleaners. The acid eats a very thin layer of the polished face, and what is left is a pale, dull mark called an etch. A strong acid does it in seconds and a weak one in minutes.

This is why marble is harder to live with here than in a city with soft water. The tap water leaves scale wherever it dries, and the standard cure for scale is the one family of products the stone cannot take.

It is soft

Marble scratches more easily than its weight suggests. The quartz grains in desert sand are harder than marble, so every grain carried in on a shoe works like a point of sandpaper under the next footstep. Nobody notices one scratch. After a few years of footsteps the main routes through the house, from the front door through the hall to the majlis and the stairs, have lost their reflection, while the floor under the sofa and along the walls still shines. That pattern is wear, and it is the most common reason a marble floor is polished.

The shine is the stone, not a coating

A polished marble tile left the factory with nothing on it. It was ground with finer and finer abrasives until the surface was smooth enough to reflect light. A glazed ceramic tile is different: its shine is a layer of glass fired onto the top. A mark on marble is therefore rarely on the shine. It is a change in the shine, and that is why so much marble damage cannot be washed away.

Marble is also porous. Liquids left standing soak in and leave stains below the surface, which is a different problem from etching and has a different cure.

First check that it is marble

Many floors that look like marble are porcelain tiles printed with a marble pattern, and they need none of this care. Look for a vein pattern that repeats from tile to tile: only a print repeats. Look at the cut edge of a tile at a threshold or beside a floor drain: marble is the same stone all the way through, while porcelain shows a plain body under a thin patterned face. If you are still unsure, ask the landlord or the developer what was laid, and treat the floor as stone until you know.

Limestone, travertine and terrazzo are calcium-based as well and should be treated exactly like marble. The care of ceramic, porcelain, vinyl and wood is set out in how each floor type should be cleaned.

An etch is not a stain

The two are confused constantly, and the confusion wastes money. An etch is lighter than the stone around it and dull. It sits on the surface, and you see it best with the light coming across the floor at a low angle; from directly above it can almost disappear. A stain is darker or a different colour. It sits inside the stone, it is visible from every angle, and the surface over it may still be perfectly shiny.

They often arrive together. A spilled glass of lemon tea etches the polish and stains the pores at the same time. A stain remover will not put back the polish, and polishing will not reach a stain that has soaked deep. Each needs its own treatment, and the stain is usually dealt with first.

The ten-minute test

This costs nothing and tells you whether to book a cleaner or look for a stone restorer.

1. 1Choose a dull tile in a walkway and, for comparison, a tile that is never walked on: under a sofa, or tight against a wall.
2. 2Vacuum both, so that no grit is dragged across the stone.
3. 3Wash the dull tile with clean warm water and a small amount of pH-neutral stone cleaner on a clean microfibre cloth. Then wipe it again with clean water alone.
4. 4Dry it with a second cloth and buff it for a few seconds.
5. 5Crouch so that a window or a ceiling light is reflected across both tiles, and compare the two reflections.
6. 6Put a few drops of water on the clean, dry tile and leave them for a few minutes. If the stone darkens under the drops, it is absorbing water and any sealer has worn off. Wipe the drops away afterwards.

What the result tells you

• The washed tile now reflects as sharply as the comparison tile. The floor has a film on it. It needs a proper deep clean and a better rinsing routine, not polishing.
• The washed tile is better but still duller than the comparison tile. There is film and there is wear. Clean the floor first; you may find the wear is acceptable once the film has gone.
• Nothing changed. The surface is worn or etched. Cleaning will keep it hygienic, but only honing and polishing will bring back the reflection.
• The water drops left dark spots. The stone needs sealing once it is clean and dry, whatever else is decided.

The routine that protects the polish

Daily and weekly care comes down to two things: keeping grit off the floor and keeping residue from building up on it.

1. 1Remove the grit first, every time, with a dry microfibre dust mop or a vacuum cleaner with a soft floor head. This matters more than the washing, because grit is what wears the polish.
2. 2Mop with a pH-neutral cleaner made for stone, in the amount the label gives. More detergent does not clean better. It leaves the film that makes marble look flat.
3. 3Wring the mop until it is damp, not wet. Water left standing soaks into the stone and the joints, and here it dries to a mineral mark.
4. 4Change the water as soon as it turns grey. Dirty water puts back what the mop has just lifted.
5. 5On polished marble, dry the floor with a clean cloth or a dry mop head after washing. With Abu Dhabi's hard water this one step makes the largest visible difference.
6. 6Blot spills at once, then rinse the spot with clean water. Blot, do not wipe: wiping spreads an acidic spill over a wider area.

What a deep clean adds

A deep clean of a marble floor gives time to what the weekly mop passes over: the film built up from months of detergent, the dirt held in a honed or textured surface, the grout lines, the edges and corners the mop does not reach, and the skirting. The cleaner is left on the surface long enough to loosen the film and worked in with a soft brush or a non-scratch pad. Then the dirty solution is picked up and the floor is rinsed with clean water. On a floor whose only problem was film, the difference is plain to see.

Our floor and tile visits cover hard-floor mopping, grout scrubbing, edges and corners and the skirting boards, and usually run between an hour and a half and five hours, depending on the area and its condition. They are priced from the ordinary hourly price list: a two-hour visit by one cleaner is AED 65 with your own products and AED 75 with ours. Where the floors are one part of a larger reset, a deep clean includes tile and grout scrubbing and starts at 2 cleaners for 3 hours each, which is AED 210 with our materials.

Where cleaning stops

No cleaner, product or amount of effort will put the reflection back into a worn walkway, remove an etch mark, take out a scratch, lift a stain that has soaked deep into the stone or level uneven tiles. Our published terms say the same in general words: results cannot be guaranteed on a surface that is physically damaged, or where earlier cleaning products have reacted with it.

A careful cleaner says this at the walk-through, before starting, and does not reach for something stronger to try to prove otherwise. On marble, stronger means acid or abrasive, and both make the floor worse. A cleaning visit can make a worn floor clean. It cannot make it new.

Why diluting the vinegar does not make it safe

Diluted acid is still acid. It etches more slowly, which only means that the damage arrives as a general loss of shine over several months and not as one obvious mark. A floor mopped every week with vinegar and water looks clean and a little flatter each time, and by the time anyone notices, the whole surface needs re-polishing.

Marble in bathrooms

Marble vanity tops, shower walls and bathroom floors meet acid from two directions: the descaler used on the taps and the toilet, and the toiletries themselves, some of which are mildly acidic. Scale on marble cannot be dissolved safely, so it has to be prevented by wiping the stone dry after use. Keep bottles on a tray, and never let a toilet cleaner or a tap descaler run or drip onto the floor. What works on scale, grout and mould around stone is covered in bathroom deep cleaning: limescale, grout and mould.

One rule applies to every surface in the house. Never mix cleaning products. Bleach mixed with an acid descaler or with ammonia gives off a poisonous gas.

Grinding, honing and polishing are one sequence

All three are the same idea at different strengths: an abrasive removes a thin layer of stone and leaves its own, finer scratches behind. The work runs from coarse to fine, each step removing the marks of the one before, until the scratches are too small to scatter light. Where it starts depends on the damage. A floor with uneven tile edges starts with grinding. A floor with etching and traffic lanes can start at honing. A floor that is only slightly flat may need the last polishing steps alone.

It is wet, heavy work. The machine is used with water, which keeps the dust down and turns the removed stone into a slurry that has to be collected and taken away. The room has to be empty. Edges, corners and the strip along the skirting are done with smaller hand tools, and they are where a rushed job shows. Walls, door frames and nearby furniture need covering.

You also choose the finish. A polished finish reflects like a mirror and shows every etch and scratch. A honed finish is matt or satin. It etches just as easily but hides the marks far better, and it is less slippery when wet. In a busy family home a honed floor is often the easier one to live with.

Crystallising

Crystallising, also called vitrification, is chemical. A liquid is sprayed onto the floor and worked in with a steel-wool pad under a weighted machine. The heat of the friction and the chemical react with the calcium in the stone, and a thin, hard, glossy skin forms on the surface. It works only on calcium-based stone: marble, limestone, terrazzo.

Its attraction is speed. Nothing is ground away, there is little mess, and a floor in sound condition comes up brighter in a single pass. Its limit is the same fact. Because nothing is ground away, scratches, deeper etch marks and uneven edges are all still there underneath, now with a gloss on top.

Opinions in the stone trade differ about relying on it. Some restorers use it routinely to maintain large floors. Others prefer abrasives alone, and point out that a crystallised skin has to be removed before the floor can be honed properly later. Neither view makes it wrong for your floor. It does mean you should ask which method is proposed and why, and be wary of a low price for 'polishing' that turns out to be crystallising over a damaged surface.

Sealing

A sealer for marble is an impregnator: a liquid that soaks into the pores and makes the stone slower to absorb what is spilled on it. It buys you time to wipe up coffee or oil before it becomes a stain. It does not make marble stain-proof, it does not add shine, and it does nothing against etching, because etching happens at the surface, where acid meets stone. Sealers wear with time and cleaning. The water-drop step of the test tells you when the stone is absorbing again.

Whole room or just the bad patch

A freshly polished patch in the middle of a worn floor looks like a mirror set into a matt surface. For that reason floors are normally restored a whole room at a time, stopping at a doorway or a threshold where a change in finish goes unnoticed. A single etched tile on an otherwise good floor can sometimes be blended in, but ask to see a test area before agreeing to it.

If several jobs are planned, the order matters

Before Eid or a family occasion, allow for this sequence in your dates. Restoration cannot be done around furniture and guests.

1. 1Repairs first: cracked or loose tiles and missing grout.
2. 2Grinding, honing and polishing, room by room, with the rooms empty.
3. 3Sealing, once the stone is clean and fully dry.
4. 4A deep clean of the rest of the home, because restoration leaves a fine residue on skirting, door frames and nearby surfaces.
5. 5Furniture back last, with felt pads under every leg, and rugs only once the floor has dried completely.

Booking a clean for a marble floor

Say that the floor is marble when you book, and point out the stone surfaces again at the walk-through on arrival. We clean marble with pH-neutral products that are safe for it. If you keep a stone cleaner you prefer, choose the without-materials option and leave the product out for the team. On that option you provide all the products and equipment, including the vacuum cleaner and the mop; the trade-offs are set out in cleaning with or without materials.

Before the visit, move small furniture, rugs and floor-standing items out of the rooms being done. The work needs water, a power socket and rooms that can be kept clear of foot traffic while the floor dries. Before leaving, the team checks the grout lines and corners with you in good light and tells you how long to wait before walking on the floor. If something on the agreed list was missed, tell us within 24 hours and it is put right at no charge.

Asking about polishing and restoration

Polishing and restoring dull marble is a separate job from cleaning. It is not part of an hourly visit, it has no list price, and it should never be assumed to be included in a deep clean. If the test tells you the surface is worn or etched, describe the floor and send photos to info@ihrdreamcleaning.com when you ask. We tell you what the floor appears to need, and the scope and the price are confirmed before anything is booked. Which of the processes in this guide applies to your floor is settled at that stage, not on the day.

Good photos make the answer quicker and more accurate, for marble as for any quoted job; the general method is in how to get an accurate repair quote. For a marble floor, send these.

• A photo of each room in daylight, showing the whole floor.
• A low-angle photo along the main walkway with a window reflected in the floor, so that the worn lanes show.
• Close-ups of the worst etch marks, stains and scratches, with a coin beside them for scale.
• The approximate area of each room in square metres, and the size of the tiles.
• Whether the rooms are furnished, and whether there are stairs, thresholds or skirting in the same stone.
• What has been used on the floor before, if you know: crystallising, wax, a sealer, acid cleaners.

Why the test patch matters most

A test patch tells you three things nothing else can: how much of the damage will come out, what the finish looks like in your own light, and whether the person doing the work is careful at the edges. A contractor who is confident of the result has no reason to refuse one.

How often does marble need polishing?

There is no fixed interval. It depends on how much grit reaches the floor, how many people walk on it and whether the finish is polished or honed. A hallway that takes shoes straight from the driveway wears far faster than a bedroom walked on barefoot. Judge by the reflection: when the walkways no longer mirror a window the way the edges do, and cleaning does not change that, the floor is due. Good door mats and a daily dust mop push that day a long way back.

Will sealing stop the dull marks?

No. A sealer slows staining, which happens inside the stone. Dull marks from acid are etching, which happens at the surface, and no impregnating sealer prevents it. The only protection against etching is keeping acids off the stone and wiping up spills at once.

Can a cleaning team bring up the shine with a buffing machine?

Buffing a clean, dry marble floor with a soft pad lifts its appearance slightly, in the way that drying a glass with a cloth does. It removes nothing, so wear, etching and scratches look exactly as they did. If a strong shine appears after a 'buff' with a liquid product, ask what the product was. It was either a coating, which will scuff and need stripping, or a crystalliser.

The floor is new. Why does it already have dull patches?

In a new or newly renovated home the usual cause is the builder's final wash. Cement and grout residue is commonly removed with an acid cleaner, which is safe on ceramic and porcelain and etches marble. Paint, plaster and adhesive splashes scraped off with a blade leave scratches. If you are taking over a new home, look at the marble at a low angle before you accept the handover, and read what the first clean after builders involves.

Do mats and rugs help?

Mats help more than anything else you can buy. One outside each external door and one inside catch most of the grit before it reaches the stone. Shake or vacuum them often, because a full mat stops working. Indoors, lift rugs from time to time so that the grit that works its way underneath is vacuumed out and does not grind against the stone with every step.