Acid is where it at.

The drano essensially is like an acid that can eat through the hair but with too much it may damage piping.

Go to Home Depot/Lowes/hardware store and buy a container of boric acid.

She is probably completely acidic, which is fueling the fire.

It depends on the subfloor.If I have clean concrete (not too much adhesive, paint etc) I do stained concrete (acid first then marbleize with acrylic)If I have concrete which cannot be stained I tile.

We used boric acid ( my dads suggestion) and made a perimeter around the yard extents, then half way between the house and yard, and finally at the basement walls of the house.

You cant carry an acid test kit and drill around with you to drill and test every payment you receive.

They had something acidic in the tub and it ate away the glaze.

My understanding is that effectiveness is due in part to the acidic vinegar having a neutralizing effect on the alkaline urine. 

Another option is to hire a specialist company that will paint your tile after acid etching so the paint adheres.