i've heard of boric acid?

I would have all the floors done in white concrete and acid stained for good looks, easy clean up and it will last long. 

It was non-acid stain, very easy to apply, and it looks amazing!

CIP deterioration is most negatively affected by soil issues (not applicable here), speed of flow through pipe (faster is better, within reason), and makeup of the effluent and gases within (mostly acidic for waste, possibly basic in heavy cleaning situations).

Batteries and battery acids are also common, dry cells and lead acid for larger models.

A typical electric water heater can make it 30 years easy if you just change the rods, unless you have super acidic water. 

It can be tested for by using nucleic acid probe molecules for detecting Naegleria species , NFOW1 or NFOW2 specifically,but takes days to sample and test.

IMHO, any type of acid wash or glaze would be totally experimental...It looks like it's pretty clean, but if not some good old TSP should handle any soot.

I can build an addition for about 120k that contains two "units" of 2bd/2.5ba each with lots of premium features (9.5' ceilings, acid-stained colorful concrete floors, radiant heating throughout, central air, LED lights, granite countertops, subway tile backsplash, carrara marble porcelain look-alike bathrooms, etc.)

Let dry overnight.If that doesn't work, use a very small concentration of muriatic acid with water.