We've been using Whink
http://www.whink.com/rust_stain_remover.htm
at our cabin for years now - it's the only thing that reliably gets out
the rust stains caused by the iron in our well without requiring
respiratory protection during use. It's mostly dilute hydrofluoric acid
(if you read the label and MSDS).
They appear to have a bunch of related products; it appears that
http://www.whink.com/rust_and_iron_stain_remover.htm
might be a better choice for concrete.
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