Removing stain in marble

[seejay]

I have an old marble fireplace that has a large disfiguring brown stain within it. I have tried bleach, ammonia etc with no success. Any ideas as to how it can be leached out. Many thanks.

[heartache]

Have you tried white vinegar? the cleaners on the tv show "how clean is your house" use it for all kinds of stains might be worth a try.