Absorbed stains come out of marble with a poultice — a paste left on the mark under plastic for 24 to 48 hours, which pulls the stain back out as it dries. Scrubbing does not work, because the stain is inside the stone rather than on it, and stronger cleaners usually make things worse by etching the surface as well. Before you start, confirm you actually have a stain: it should be darker than the marble around it. A lighter, duller mark is an etch and a poultice will do nothing for it.
First, confirm it is a stain
Wet the mark with a little water. A stain stays visible and stays darker. An etch briefly disappears while wet — because the water fills the roughened surface and mimics the polish — then returns as it dries.
Which poultice to use
- Organic stains — Baking soda mixed with water to a peanut-butter consistency (coffee, tea, wine, fruit).
- Oil and grease — Baking soda with water, or a flour-based poultice — oil and grease stains need the absorbent to sit longest.
The poultice method, step by step
- Wet the stain with distilled water first.
- Spread the poultice about 5 mm thick, overlapping the stain edges.
- Cover with plastic wrap and tape the edges down.
- Leave 24–48 hours. The drying is what pulls the stain out — this is why rushing it fails.
- Remove, rinse with distilled water, buff dry with a soft cloth.
- Repeat if the stain faded but did not clear. Deep stains take several rounds.
The drying is the active step
A poultice does its work as it dries — that is what draws the stain up out of the stone. Lifting it early is the most common reason the method appears not to work.
When to stop and call a professional
- The etch or scratch is deep enough to catch a fingernail.
- The damage covers a large area rather than one spot — patch-polishing a wide area leaves visible bright spots.
- The marble is honed and you want the mark gone. Polishing powder puts a shine where there was none.
- There is yellowing, cracking or chipping.
- The table is antique or the slab is thin — both raise the cost of a mistake well above the cost of advice.
Frequently asked questions
How many times do I need to repeat it?
Deep or old stains often take three or four rounds. If a round lightens the mark at all, repeating is worth it; if nothing changes after two, the mark is probably an etch.
Can I use hydrogen peroxide?
For organic stains on light marble, a flour and hydrogen-peroxide poultice is common. Test somewhere hidden first — peroxide can lighten some darker stones.
What about rust marks from a plant pot or tin?
Rust is one of the hardest stains and often permanent. Poultices designed for rust exist, but set your expectations low and never leave metal sitting on marble again.
Related guides
Sources
- Natural Stone Institute — Removing Stains from Stone — view
This is one part of looking after stone furniture. For how the material behaves in the first place, and which pieces suit which rooms, see Marble Furniture: The Complete Buyer’s Guide.