What do professional exterminators use to kill ants?

 https://ampmexterminators.com/am-pm-seattle-ants-control-removal-service-exterminators-get-rid-of-ants-in-homes-or-commercial-business-buildings/

Give the ants a chance to take the treatment back to their respective nests

Excesses moisture from the rain gets  in the threshold wall which attracts ants.

From the poor drainage( No downspout)

Avoid vegetation contact on the walls 

Ants on the wall from the vegetation contact

Avoid vegetation contact as it attracts ants

Avoid vegetation contact on the wall

Avoid vegetation contact on the wall 

Avoid vegetation contact on the wall

Avoid vegetation contact

Avoid the Excessive moisture in the door threshold by replacing the downsprout

Avoid Excessive moisture 

Avoid the excessive moisture and vegetation contact