The spray pesticides and the barriers will not get rid of them once they are present.
Buy some Terro Ant Killer... liquid is probably best as the ant regurgitate water onto sugary substances and then draw it back in.
Place it in areas that you see the ants and near water sources (usually places were humid air forms condensation - sort of like the toilet bowl)... the ants will take the bait back to the queen and the colony will be killed off.
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