Urine stained concrete?

Does anyone know how to take care of urine stains on concrete? I’m submitting a proposal for a veterinarian facility and they have what appear to be some urine stained concrete pillars. Anyone know how to get these taken care of?Uploading…

It might be permanent. Urine is very acidic so it’s possibly changed the chemical composition of the concrete. Then again maybe not, just a thought. Does anyone know how to remove an acid stain?