Strange stains on new white concrete

Anyone seen these before?
I haven’t been there yet. My plan is 1) sh; 2) ebc; 3) acid (Barc or mild muriatic acid).
They are white decorative concrete designed for indoor use; so they are willing to pay to make it look good.
Any tips or experience to share, please?

Man I’d post this on the Front 9 Facebook group and let Craig comment first before you start throwing chems at it.

…and see if you can get the process used to form those, it may give you a clue.

What does the company that poured/installed it think?

If I were them and didn’t know, I’d be on a concrete forum asking what happened.