Diazinon was the shizz. Until they banned its sale in late 2004. If you still have some, you can use it, but they no longer sell it.
When I first moved into my house, back in 2000, it was a new neighborhood and their was still construction going on behind my house.
Had a huge ant problem. Diazinon fixed it QUICK. Didn't SEE another ant for years.
Just had some in my kitchen and got some liquid Ortho spray and that seems to work well, too. Sprayed it all along the border of my house.