Stone Care: Sealing, Polishing and Stain Removal

Natural stone is one of the longest-lasting finishes in an Indian home. Marble floors laid two generations ago still shine in many Gujarat and Rajasthan houses; Kota floors in old bungalows have outlived three sets of furniture; granite kitchen counters survive decades of daily cooking. Yet stone is also easy to damage in a single afternoon: a squeeze of lemon on a white marble counter, a bottle of toilet cleaner used to scrub a bathroom floor, an oil lamp left on Kota during Diwali, or a well-meaning maid scrubbing with a steel scourer. Most of the damage seen on Indian stone is caused not by age but by the wrong cleaner.

The difficulty is that different stones need opposite treatment. Marble and Kota are calcium carbonate and dissolve in mild acids that granite ignores; granite and sandstone can be porous and absorb oil that dense marble resists; a sealer that protects one stone may darken another. Household advice — vinegar for shine, acid for stains, phenyl for germs — is often wrong for one stone or another. This article sorts stone into families, sets out what each one tolerates, explains sealing and how to test for it, gives step-by-step poultice methods for the stains Indian homes actually face — oil, haldi, tea, rust, ink, wax and hard water — and explains how grinding and polishing restore a dull or etched floor.

A safety principle runs through everything below: test any cleaner, sealer or poultice in a hidden spot first — inside a cupboard, under a sofa, on a spare tile or offcut — and wait for the result before treating a visible area. Strong chemicals, acids and solvents also need gloves, eye protection and ventilation, and some products must never be mixed. Where a stain or damage is extensive, a professional stone-restoration contractor is usually cheaper than a failed home experiment.

Know the stone: two families with opposite weaknesses

Stone care begins with identification, because natural stones fall into two broad chemical families. Calcareous stones — marble, limestone (including Kota and Shahabad), travertine, onyx and terrazzo made with marble chips — are composed mainly of calcium carbonate. They are relatively soft and they react with acids: even a weak acid such as lemon juice or vinegar dissolves the polished surface and leaves a dull mark called an etch. Siliceous stones — granite, quartzite, most sandstones and slate — are composed mainly of silicate minerals such as quartz and feldspar. They are harder and resist household acids, but many varieties are more porous and absorb oil and coloured liquids. Engineered quartz is not a natural stone at all; it is crushed quartz bound with resin, and it needs its manufacturer's care instructions, especially regarding heat and strong solvents.

Stain or etch? Diagnose before treating

Two kinds of mark look similar to an untrained eye and need opposite treatment. A stain is something that has soaked into the stone and coloured it: it is usually darker than the surrounding stone (oil, ghee, tea, coffee) or a distinct colour (haldi yellow, kumkum red, rust orange, ink blue). The surface over a stain usually still feels smooth and shiny. An etch is physical damage to the surface caused by acid on calcareous stone: the mark is dull, lighter or cloudy rather than darker, often in the exact shape of a spill, a glass ring or a lemon slice, and it can be felt as a slight roughness with a fingernail. A stain is drawn out with a poultice; an etch cannot be cleaned away, only re-honed and re-polished.

A third common problem is a white powder on the surface — usually efflorescence, salts carried up through the stone by moisture from the screed or wall behind. It appears on new floors and on ground-floor and external stone in the monsoon. It should be dry-brushed or vacuumed off, not washed (water dissolves the salts and carries them back into the stone), and it will keep returning until the moisture source is dealt with.

Daily cleaning: what to use and what to avoid

For daily care, the safest cleaner for all natural stone is plain water and a soft microfibre mop, with a small amount of pH-neutral stone cleaner or a few drops of mild, neutral dishwashing liquid in a bucket when needed. Sweep or dust-mop first: grit carried in on shoes acts like sandpaper on polished marble and Kota. Doormats at every entrance, felt pads under furniture legs and coasters under glasses prevent most wear. Wipe spills at once, especially acidic ones on marble and oily ones on any stone.

Sealing: when, which sealer and how often

A sealer does not make stone stain-proof. It slows down absorption, giving time to wipe a spill before it soaks in. That is valuable for porous stones in kitchens, dining areas and bathrooms, and pointless for very dense stones that absorb almost nothing — a sealer that cannot penetrate stays on the surface as a sticky, hazy film. So the first step is always a test. Place a few drops of water on the stone in several places, including a high-use area, and leave them for 10–15 minutes. If the stone darkens under the drops, it is absorbing and will benefit from sealing. If the water still beads and the stone does not darken, it is either dense enough not to need sealing or its existing sealer is still working. Repeat the test every few months on kitchen counters and floors.

For almost all interior stone in India, a penetrating or impregnating sealer is the right choice. These are typically silane, siloxane or fluoropolymer-based products in a water or solvent carrier; they soak into the pores and leave little or nothing on the surface, so the stone keeps its natural look and slip resistance. Topical coatings — waxes, acrylics and polyurethanes — produce a shine of their own but wear unevenly in walkways, can trap moisture from below (a real problem on ground-floor stone in the monsoon) and must be stripped with chemicals before a floor can be re-polished. Apply a penetrating sealer on clean, completely dry stone — after a wet wash, wait at least a day or two, longer in humid weather — following the maker's coverage and drying times, and buff off any excess before it dries on the surface.

Removing stains: the poultice method

Stains in stone are removed by drawing them out, not by scrubbing them off. A poultice is a paste of an absorbent powder mixed with a liquid chemical suited to the stain. The chemical dissolves the stain inside the stone; as the paste dries slowly, it pulls the dissolved stain up into the powder, which is then lifted away. Common absorbents are talc, kaolin or china clay, diatomaceous earth, whiting and fuller's earth (multani mitti); plain white paper towels soaked in the chemical can work for small spots. Use white or neutral absorbents on light stone, so that the poultice itself does not leave colour behind.

Hydrogen peroxide of the strength used for stone poultices — commonly sold at about 6–12 per cent for hair bleaching — is stronger than the 3 per cent antiseptic solution in a first-aid kit and must be handled with gloves and eye protection. Acetone and mineral spirits are flammable: no diyas, gas burners or smoking nearby while they are in use. If in doubt about a product, check its label and safety data sheet, and test it on an offcut or a hidden spot first.

Etches, scratches and dull floors: honing and polishing

When marble or Kota loses its shine — from etching, scratching, years of foot traffic or a previous topical coating — the remedy is mechanical: the surface is ground and polished with progressively finer abrasives, exactly as it was polished in the factory or on the day it was laid. A single small etch on a marble counter can often be removed by hand with a marble polishing powder or a fine diamond hand pad, following the product instructions. Floors need a machine and an experienced operator. Indian practice is to grind with coarse abrasives to flatten the floor and remove lippage at the joints, then hone with finer grits, and finally polish with very fine diamond pads or polishing powders to the gloss required.

Choose the finish by the room. A high polish looks spectacular in a living room but shows every etch and becomes slippery when wet; a honed or satin finish hides minor etches and footprints and is safer in kitchens, bathrooms, entrances and around pooja areas where oil and water fall. Some contractors offer crystallisation, a chemical treatment applied with a steel-wool pad under a machine that produces a quick shine on marble; it alters the surface chemically and needs repeating, and many restoration specialists prefer straightforward diamond polishing. It is never used on granite. Whatever the method, ask the contractor to protect walls, skirtings and furniture from slurry, to collect and dispose of the slurry rather than washing it into drains, and to seal kitchen and dining areas after the floor is dry.

These are indicative October 2026 ranges for Indian cities. Prices rise for small areas, furnished homes, upper floors without a lift, stone with deep lippage or heavy damage, and for mirror finishes; they fall for large empty floors. A typical 1,200 sq ft marble flat re-polished at ₹25–60 per sq ft costs roughly ₹30,000–72,000 — a small fraction of the cost of new flooring, which this site's marble flooring guide puts at about ₹250–800 per sq ft installed for Indian marble.

A maintenance calendar for stone

From lime and wax to diamond tools: past, present and future

Traditional Indian stone floors were polished by hand. Kota and marble were rubbed with abrasive stones and water over many days, and households maintained the shine with regular washing and, in some regions, with natural oils and waxes. The arrival of electric grinding machines in the twentieth century made mirror-polished marble floors affordable for ordinary homes, and the polishing contractor with a rented machine became a familiar sight in every Indian city. Today diamond abrasives in metal and resin bonds have replaced most traditional abrasive blocks: they cut faster, give a more even finish and produce a polish that relies on the stone itself rather than on a coating.

The direction now is towards gentler, cleaner care: pH-neutral cleaners in place of acids and harsh powders, water-based penetrating sealers with lower solvent emissions, and slurry-collecting machines that keep dust and waste out of homes and drains. Honed and leathered finishes, which hide etches and resist slipping, are gaining ground over mirror polish in kitchens and bathrooms. Above all, more homeowners understand the basic rule — know the stone before choosing the cleaner — which prevents most damage before it happens.

Rules for caring for stone

• Identify the stone first: calcareous (marble, Kota, travertine, terrazzo) or siliceous (granite, quartzite, sandstone).
• Never use lemon, vinegar, toilet cleaner, descaler or acid on marble, Kota or terrazzo.
• Clean daily with water and a microfibre mop; use a pH-neutral cleaner weekly.
• Test any cleaner, sealer or poultice in a hidden spot or on an offcut first.
• Seal only when a few drops of water darken the stone within 10–15 minutes, and use a penetrating sealer.
• Draw stains out with a poultice matched to the stain; never scrape polished stone with metal.
• Never mix bleach with ammonia or acidic cleaners; wear gloves and eye protection with chemicals.
• Restore dull or etched floors by diamond honing and polishing rather than by coating them.

Frequently asked questions

How do I remove lemon or vinegar marks from marble?

Those dull marks are etches, not stains — the acid has dissolved the polished surface. They cannot be washed off. Light etches on a counter can often be polished out with a marble polishing powder or a fine diamond hand pad; deeper or widespread etching needs professional honing and polishing.

Can I use Harpic or toilet cleaner on a marble bathroom floor?

No. Most toilet and tile cleaners are acid-based and will etch marble, Kota and terrazzo, and can damage cement grout on any stone. Use a pH-neutral cleaner on the floor and keep toilet cleaner inside the bowl only.

How do I remove a haldi stain from marble?

Blot up any fresh spill without rubbing. On light marble, a poultice of hydrogen peroxide with talc or kaolin usually lifts the yellow; haldi stains also tend to fade over several days of daylight. Test in a hidden spot first and avoid acidic stain removers.

How often should granite be sealed?

Only when it needs it. Leave a few drops of water on the counter for 10–15 minutes: if the stone darkens, seal it with a penetrating sealer; if it does not, it is dense enough or still sealed. Dense black granites often never need sealing; lighter granites typically need resealing every 1–2 years in a busy kitchen.

How much does marble floor polishing cost?

Indicatively, grinding and polishing costs about ₹25–60 per sq ft for Indian marble and ₹30–70 for imported marble in October 2026, so a 1,200 sq ft flat costs roughly ₹30,000–72,000. Heavily damaged floors, mirror finishes and small jobs cost more.