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If you want something that actually works, try a registered pesticide. Fipronil is the most efficacious chemical available for controlling ants. I don't think it's available as a consumer product but there are a multitude of professional pest control products with this active ingredient, including sprays, dusts and baits.
You probably need to employ a pest manager to assess your situation. As in most situations it's cost effective in the long run to employ a professional.
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