Greg Esres writes:

I am concerned about thoroughly rinsing; it's not like a porch that I
can hose off. This is in the middle of my house. I was thinking of
mixing some baking soda in with the rinse water.

What's the issue with rinsing? Concrete is very alkaline and will
neutralize any HCl residue if you scrub it in and then sponge it up.