A brown ant home infestation usually occurs when the ants are foraging for food or water. Removal of leftover food around the house and drying excess moisture does not guarantee the brown ant's exit from your home. Ensure a brown ant colony never returns to your home by using a bait insecticide. While aerosol and homemade insecticides only effect the contact areas, baits are taken back to the nest where it is eaten. Baits give you an opportunity to attack the source of the problem -- the nest -- as opposed to continuous spot treatments with sprays.
Mix 1 tablespoon of boric acid with 1 tablespoon of peanut butter in a cup or small bowl. Use different spoons to prevent cross contamination.
Spread the peanut butter and boric acid mixture onto a cracker. This cracker serves as your brown ant bait.
Place the cracker inside a small cardboard box and punch holes in the box with a pair of scissors, a knife or any other blunt object capable of penetrating the cardboard.
Place the cardboard box with bait near an ant trail or near the nest if the location is known. Watch to see if the ants are attracted to the bait -- the smell of the peanut butter should be sufficient to attract the colony. The brown ants will enter the box and take the bait. Some ants die inside the box and others bring the bait to the nest.
Spray any remaining errant brown ants with a mixture of glass cleaner and dish soap. This mixture kills brown ants soon after contact and is safer than aerosol insecticides.