I live in Utah, where black walnut trees are not native and are fairly rare, [but I have two large ones]so this is why no one here has knowledge of solving my problem. The outer coverings of the walnuts have gotten smashed on my concrete driveway and caused big brown stains. Is there a product that will remove the stains?? Please advise and also indicate where I can purchase the product.
Thank you,
Robert Mitchell
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