20 Mule Team Borax. You can buy it in the grocery stores with the detergent. Mix half powdered sugar with the borax and sprinkle some on them. They take it back to the nest and they should be gone in a week. When you first start to see them sprinkle them. If you know the trail sprinkle the trail. I spinkle around the windows and doors.
Becareful though, toxic !
Normal salt is supposed to work also, and have heard that even soppy water works to kill them, but does not affect their nest. The trick is to get rid of the nest ...
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