Cheap, safe, nontoxic (to people, plants & animals that is:). 8-)
Just about every cable or satellite guy we've ever encountered carries a big spray bottle or super soaker filled with dish soap liquid and water. Cheapest brands seem to work best. We use Dawn. Squirt as much of the hive as you can, especially the entrance. You can take down the flying guards too, then stomp them, because the soap film gums up their wings.
Dish soap is toxic to wasps, hornets, and yellow jackets. Big nest or small, they won't even try to clean it, they will abandon the nest :-D, leaving the larva to starve. If you want to be proactive, dish soap spray all under your eaves, and anywhere else that wasps like to build, including around here, under vehicles.
The sticky residue will repel them for 6 months to a year, depending on how many side ways rains you get or massive puddles you drive through. I spray the U and T posts in my garden, because the red wasps otherwise seem interested in them.
We keep soap squirt bottles in the yard, garden, poultry yard, kids play yard etc, but we will NOT be keeping them at the hives. Dish soap it appears is ALSO toxic to bees. My husband knows of at least one unwanted beehive in a wall that no one wanted to remove, that was gotten rid of with dish soap, sprayed liberally around the entrance several days running.
Unknown whether it killed the hive. :'(Hopefully it just abscounded.