I’ve found the coolest way to exterminate insect pests. If you take a can of compressed air (like the kind you clean your keyboard with) and hold it upside down, it will deliver a freezing spray when the trigger is pressed.
Apparently this is enough to kill most pests instantly. I’ve used it on ants, roaches, and those large mosquitos that rest on the wall. The great part is, your house isn’t left smelling like DDT!