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Industrial strength rust stain remover for stains and discoloration associated with rust and other oxidation. For use on all colorfast fabrics, carpeting, upholstery, white sinks, toilet bowls, concrete, stucco, painted and unglazed ceramic surfaces. When used as directed, the product effectively penetrates and removes even the toughest rust stains. Highly effective formula does not contain Hydrofluoric Acid, making this product safer for you and your health.