On 2015-06-30, Muggles wrote:

Maybe gas them all with some wasp spray? I was wondering the same
thing.

http://www.homedepot.com/p/Raid-1-5-oz-Deep-Reach-Insect-Foggers-3-Pack-81595/100195834

I used these against a several-seasons-large wasp nest in one of my
late mother's storage sheds. Took two yrs and 5 foggers, but they're
completely gone, now, and the local wasp population has been reduced
by 95%. (still haven't found the physical nest)

nb