Are these ants indoors? Any ammonia based household cleaning agent will remove their formic acid based trails to whatever they have found.
don't forget the copper coin trick, works a treat.
and boiling water. that too.
You might be surprised at how few copper coins are made from copper - try running a magnet across your loose change... ... not that ants carry magnets?
@Rodolfo started
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Are these ants indoors?
Any ammonia based household cleaning agent will remove their formic acid based trails to whatever they have found.