The materials in natural stone countertops may vary. When confronted with an oily stain on a natural stone surface, it may be tempting to use a citrus-based degreaser, to try to lift and remove the dark blot. Marble, however, is especially sensitive to acids, and while a citrus/d-limonene solution may seem like the natural choice to counteract grease, it could in fact damage the natural surface of the stone. So instead, there are milder solutions to try.
Before moving on to the most difficult soaked in stains; it is worth noting that a well-sealed natural stone countertop is likely to be extremely resistant to oil and grease stains. Although natural stone is porous itself, a sealants are often applied after installation and are recommended to be re-applied regularly to help maintain the stain resistance surface. For a natural stone surface that is well sealed, soak up and remove the stain with clean dry paper towels. Use a blotting, rather than wiping motion. Apply a small amount of neutral pH soap like Dove to a clean wet sponge. Sponge the affected area to remove remaining oil residue. Once the entire area has been cleaned, remove the soap residue with a wet sponge that is free of soap. Use a squeegee to wick away extra moisture and avoid over-wetting and pooling; that may damage your countertop and encourage build-up.
For an unsealed surface, or otherwise set-in stain, use a neutral poultice made from cornstarch. Use blotting, rather than wiping motions in the cleaning process to avoid spreading the stain.
Familiarize yourself with the chemicals you are wishing to clean to insure that your countertop will not become damaged. Use a clean paper towel to clean up any unwanted chemical from your countertop. Natural stone countertops are best cared for with mild pH neutral products, and may periodically benefit from being re-sealed so that they can continue to resist stains and other substances that may corrode the counter's surface.
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