If you can figure out exactly which walls there in you can drill small holes and inject chemical to kill them that way ...... Then keep a chemical barrier on outside of house and broadcast the ENTIRE yard with a poison granule ...... You can't kill all the ants in the yard but you can drive them to your neighbors yard ...... Best chemical hands down is Demon WP you can get it at any feed store ..... Mix it as directed no need to mix it extra strong
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