I know I'm in a different area than you, but wanted to share what I do for outdoor ants in my yards/driveway. I also don't have fire ants, my ants are more domesticated species
I sprickle liberally BORAX onto the ant hills, It controls them,,,,,, at least my type of ants quite well. Of course the borax works only if it is dry, and ants get it on their leggs as they walk across it. They clean themselves by eating all the dirt/dust etc, off their bodies.
Borax is non toxic. It causes gastro-intestinal air to develop. Ants cant fart, so they pop.
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Do you mean Borax Detergent?