+1 That stuff works great.get some TERRO. Ants eat it and take it back to their nest, wipes them all out. You can buy it at Wal-Mart or most hardward stores ,CVS also has it.
I worked in Pest Control for two years. The number one reason people have ants (not insulting OP here and speaking from my experiences) is cleanliness. We'd get calls and the place would be a mess , not Hoarders-messy, but a mess. Food all over, dirty house even dirty yards.
If you feed them, they will come!