Muratic acid stain

GC used muratic acid to clean this concrete after a patching job in an attempt to even out the appearance but now it’s left some brown discoloring stains. What caused it and how should it be fixed?

Fisrt thing that comes to mind is OA or F9. Looking for suggestions from someone who’s dealt with muratic acid staining.

I have use MEK, with good results. Maybe try an alternative of it that doesnt evap so fast like Toulene.

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