Black stain removal on hardwood flooring?

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Recently discovered black staining, under a pot plant, on my hardwood flooring. Is there a product that will removed or bleach-out the stain? Is ther still a product called, Foxey's stain-out? Do you continue to recommended the product and if so, how do I order it?
Sincerely,
Maxie Weaver
maxieweaver@yahoo.com