Fill a shop vac with soapy water then place the head attachment near the source of the insects.
Getting rid of wasps in attic.
It is very easy for wasps to get into attics normally due to openings around vents and or poor construction practices that leave big gaps between the sections of wood near the areas where the shingles and gutters meet up.
Spray the nest according to the directions on your spray.
Because they are a dangerous pest i would recommend calling the local orkin branch office and asking them to send over a highly trained orkin pest specialist.
Leave the shop vac on for a few hours to catch as many of them as you can.
Getting rid of the nest is a bit difficult as compared to a single wasp but if you take the appropriate measures you will surely be successful.
If your wasps have built a nest on the floor of your attic bomb style wasp poisons work very well.
Locate the part of the attic where the hornets and wasps are coming and going.
Another very common place to find wasps nesting is in attic spaces.
The orkin pest specialist will inspect and develop a customized solution backed by science that best meets your needs.
You need to locate the nest first.