According to this page, dusting the best is the other way of getting rid of the wasps. You can try dusting it through powdering with a version of insecticide. Just like in spraying you can wear protective clothing, and after you have sprayed, you can decide to get out of there. You will be required to do this many time, and you will get that the wasps will die over time. You can be sure that you can view here for more on how to prevent the future infestation of the wasp through patching the hole sand gaps in your exterior.