There is a wasp nest somewhere on our property, and it's resulting in wasps getting into the house. I've probably had to kill four or five wasps within the last two weeks. As much as I love spraying Raid and Wasp Killer outside, I can't exactly be running around the house spraying it, especially with a bunch of small mammals living in the house (let's not forget that Raid is a neurotoxin).
So what do I do? I use hairspray and thick-soled shoes.
From as far of a distance as I can get, I spray a generous amount of hairspray on the wasp. This causes their wings to become sticky and heavy, forcing them to eventually fall to the ground and attempt to clean the hairspray off. When they fall to the ground -- while wearing my shoes -- I stomp on them with everything I've got. The extra force is necessary; wasps seem impervious to the traditional methods of insect-killing (fly swatters et al) and -- trust me on this one -- you don't want to just *injure* a wasp. Wasps are incredibly aggressive and have zero issues stinging you to prove a point.
And remember: the hairspray alone will not kill them. It might take them a while, but they can and will clean the hairspray off and be perfectly fine.
For someone like me, who uses so little hair spray that she still owns hair spray from her days going to high school dances, this is perfect. Actually, what would be perfect is to not have any wasps near or in my house, but we can't have everything.