How to Remove Stains from a Marble Worktop Safely

First, work out what kind of stain you have

Identifying the stain matters because each type needs a different treatment. Organic stains from tea, coffee, red wine and fruit tend to be pinkish brown. Oil stains from butter, cooking oil or cosmetics darken the stone and often have a soft, spreading edge. Rust stains from tins, pans or cast iron trivets are orange or brown and sit exactly where the metal stood.

One common problem is not a stain at all. If the mark looks like a dull, lighter patch, often ring shaped, it is probably etching, which is surface damage from acid in lemon juice, vinegar or some cleaning sprays. Etching cannot be drawn out with a poultice because nothing has soaked in; the polish itself has been eaten away. That needs re honing or re polishing, which is a job for a professional with diamond abrasives.

The poultice method that stonemasons actually use

A poultice is a paste that sits on the stain and slowly draws it up out of the stone as it dries, a bit like a reverse sponge. You can buy ready made poultice powder from stone care suppliers for roughly 10 to 20 pounds, or make your own by mixing an absorbent powder such as kaolin, fuller's earth or even plain flour with the right liquid for the stain type.

Expect to repeat the process two or three times for a stubborn or older stain. A stain that has sat in the stone for months will rarely lift in one go, so do not judge the result until the second attempt.

• Organic stains (tea, coffee, wine): mix the powder with 12 percent hydrogen peroxide from a chemist into a paste like smooth peanut butter
• Oil stains: mix the powder with acetone instead, and ventilate the room well
• Rust stains: use a purpose made rust remover formulated for marble; never use general rust removers, which are acidic and will etch the surface
• Spread the paste about 5 mm thick, overlapping the stain edge by 2 to 3 cm
• Cover with cling film taped at the edges, leave for 24 hours, then remove the film and let the paste dry out fully for another 24 hours
• Scrape off with a plastic scraper, rinse with clean water and dry with a soft cloth

What never to use on marble

Marble is mostly calcium carbonate, which reacts with acid on contact. That rules out a surprising number of everyday cleaners. Vinegar, lemon juice, limescale removers, most bathroom sprays and anything labelled with a low pH will leave dull etch marks that cost more to fix than the original stain. Bleach is also risky on coloured marble, as it can lighten the veining unevenly.

Abrasives are the other trap. Scouring powder, wire wool and the rough side of a washing up sponge will scratch a polished finish. For day to day cleaning, warm water with a few drops of a pH neutral stone soap is all a marble worktop needs. In London's hard water areas, dry the surface after wiping, because mineral deposits from tap water build up quickly and dull the polish.

Sealing: your best defence against the next stain

A good impregnating sealer soaks into the stone and buys you time when something spills, turning an instant stain into one you can simply wipe away. On a kitchen worktop that sees daily use, resealing every 12 to 18 months is a sensible rhythm, though it depends on the marble and how the worktop is used. A quick test is to drip a little water on the surface; if it darkens the stone within a few minutes rather than beading, the sealer has worn through.

Sealing a typical kitchen worktop yourself costs around 20 to 40 pounds in materials and an hour of work. It is well within reach of a careful DIYer, but the surface must be completely clean and dry first, so deal with any existing stains before you seal, otherwise you lock them in.

When to call a stonemason

If a stain survives three poultice attempts, sits along a joint or crack, or covers a large area, professional treatment is the safer route. The same goes for etching, scratches and dull patches, which need honing and re polishing with progressively finer diamond pads rather than any chemical treatment. Restoration of a marble worktop in London typically runs from around 150 to 400 pounds depending on the size of the surface and the condition it is in, which is a fraction of the cost of replacement.

At Stannic Stones we see plenty of worktops written off by their owners that come back beautifully with a day's work. If you are unsure whether a mark is a stain or an etch, send us a photo before you try anything aggressive, and we will tell you honestly whether it is a DIY job or one for us.