A corner of our property recently got busy with a bunch of wasps coming and going, found a ground nest opening under some shrubs. Hit the nest twice at night with foaming spray poison with zero results. Next attack was with 5 gal buckets half filled with hot water and Dawn poured onto the opening and repeated the following night. Nest activity quickly diminished over the next several days to just a few wasps wandering around the shrub, and they disappeared after giving the area another douche...thumbs up for the Dawn method