Clr
I used a product called CLR (I think - I'm still in Ohio, it's in Florida). I think I got it at Color Wheel, on 466. All hardware stores and even Publix probably have it, or something similar.
It's in a gray plastic bottle. Mix according to directions and scrub with a brush, rinse off with a hose. We have since painted our CYV wall a darker tan/taupe instead of the original cream, and rust doesn't seem to show as much, haven't cleaned it since.
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