Marble stains, etching and dull spots: what is different?

Describe the change before treating it.

Record when the mark appeared, its location and what may have contacted the surface. Photograph the area in ordinary and reflected light. Keep the stone name, finish and treatment information if available. A dark patch, pale ring or loss of reflection may require different advice.

Do not stack several cleaning products in an attempt to remove an unidentified mark. Tell the supplier or restoration professional what has already been used so the next step can be assessed.

Keep care claims separate.

The Natural Stone Institute explains that acidic products can etch calcium-carbonate-based stone, while impregnating treatments improve resistance to staining without making a surface stain-proof. Sealing is not a remedy for every kind of mark.

Use the care instructions for the actual stone and treatment. For an uncertain or persistent mark, seek a diagnosis rather than assuming it needs stronger cleaning, another coating or a polishing product.

Build a simple maintenance record.

Keep the product names and dates of any applied treatment. Note the recommended cleaning method and the contact for restoration advice. This is especially useful when a property changes hands or several teams clean a commercial space.

For a repair proposal, ask what will change in colour, texture or gloss and whether a sample area can be reviewed. Agree the expected result and the limits before work begins.

Your checklist

Questions before the next step