How do I remove yellowed stain from old Marble?
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http://www.designsponge.com/2013/01/before-after-cleaning-and-restoring-marble.html ; I've never tried this, but lots of tutorials use harsh chemicals that may do more damage than they fix -- marble is very soft and porous and most anything that 'gets on it' will get 'IN' it!
https://homesteady.com/facts-7244902-can-yellow-stains-marble-top-table-.html
I found a cigarette smoke stained marble lamp at a Flea Market and cleaned it up (not all, but pretty well) by rubbing it with halved/cut lemons. I applied many applications. There are strong acids used to professionally clean church marble steps, etc., but I do not recommend their use by neophytes, like me.
You can make a past of OcyClean, and apply that. Dribble water on it occasionally, because it dries. Rinse. Repeat until gone.
stay away from vinegar though- it will scratch it up bc of the acid