I would suggest borax and sugar(or powdered sugar) mixed together in water. They will love the sugar and if you live in a dry area(or if it's been a bit since it rained) they won't be able to resist the water. I would try to find where they are making their way inside and put it there. The workers will take the borax back and feed it to the queen, and she will die...end of colony. You may want to make a few dishes and put them around in a few areas.
NOTE: Borax is bad for humans cats and animals, so maybe put your solutions in Tupperware containers with a couple holes poked in them(or something similar) so the ants can get in but no animals. I hope you find a solution to this. Another option I think would be to get some ladybugs. Eliminate the aphids and maybe the ants will leave to.
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We tried last year, not with Borax but yeast. They didn't even look at it.
I will need to look up if it works that way. The ants were there before the aphids... But then again... less aphids will probably mean less ants (an it will be more enjoyable to work in the greenhouse, lol)
I might just give it a try, thanks, @johndoer123