May 11
Remove Rust Stains From Concrete
Posted on Wednesday, May 11, 2011 in rust removal techniques
Will EDTA in aqueous solution remove superficial rust stains from concrete?
It wouldn’t be a great way to do it, IMO. I would be afraid it would chelate the Calcium in the concrete, using up most of the EDTA before it goes after the rust stains. Try a hot solution of Oxalic acid and a little vinegar. It will still attack the concrete, but will oxidize the Fe into a soluble form.
How do you clean stains on concrete?