Stain on marble slab outside bathroom

Old 08-21-23, 09:57 AM
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Stain on marble slab outside bathroom

This mysterious stain appeared on the tile slab outside the bathroom. Must be a cleaning product of some sort. I put a paste of baking soda and water on it for a few days, but that had very little, if any, effect. Wondering if DIY'ers might have any suggestions. TIA.
Old 08-21-23, 10:06 AM
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It looks like an oil stain. If so I'd try a solvent (alcohol, acetone, mineral spirits...) by placing a small puddle on the spot. Let it soak in for several seconds. Then wipe off. The idea is the solvent breaks down a small bit of the oil and floats it to the surface where you can wipe it away. This requires many repeated attempts as you only remove a small bit on each try.
Old 08-21-23, 10:32 AM
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Try acetone to dissolve and remove the stain from the marble's serrated inner structure. Acetone evaporates very quickly and leaves no residue. Fingernail polish remover generally has a very high percentage of acetone but often contains a slight amount of clear castor oil that will not stain, as it is greatly diluted and will evaporate quickly with the acetone. Pronto brand nail polish remover is 100% acetone if that matters to you. A small bottle of fingernail polish can be purchased at any drug store.
Old 08-21-23, 01:26 PM
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And the marble will need to be sealed (again?) afterward. Personally, because it is both so soft and so porous, I think marble is a nightmare surface.

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