Demon MAX Insecticide
I've used both the liquid concentration, as well as the powder version. Both work the same way, so it just comes down to your preference. Either way, you'll want to have a sprayer for both versions of this poison. I personally use them as exterior sprays along the foundation, around entry points (e.g. door thresholds, exterior window edges, etc), and any immediate surface area right in front of the access points into the home. Early on, I saw scorpions crawling up the exterior walls of my house, so I routinely spray a poison along the foundation and lower portion of the exterior wall of the house to eliminate any scorpions that dare to do so.