Rust stain on brick chimney

One restore? Oxilic acid? Or just start with f9?

I love one restore but I would try the f9 barc, probably less applications with it.

This is a restoration job. Better charge pretty for it and explain it’s a restoration process not just a cleaning due to the “damage”. F9 barc and multiple applications, even scrubbing between applications would be my go to

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Thank you guys for the advice

I told her when she sent me the picture we were looking at least $500