Here's something I learned several years ago, I had a bunch of hornets in my gargae & I didn't have any bug spray & I didn't want to spray anything flammable in my garage, so I grabbed the first thing I saw, Lemon Pledge Furniture wax aerosol. It drops 'em like Mike Tyson. I don't know if it gums up their wings or lungs or what, but once they're down, you just step on 'em.:blob:
(Plus it leaves a lemony fresh scent! lol)
