If its a weep vent - I can't see the hole - then saturate the area with the Raid, then plug the hole temporarily with a twist of paper.....the wasps will soon get the message.
John
I did not know that wasps can read messages!
If they cannot, or do not, and do not obey you then there is another possibility!
Get a vacuum cleaner with a pipe and try to make the pipe longer, perhaps with plumbing waste pipe. Then use it at dusk when they return from their day's foraging and hold the open end against their entry point. They will be sucked into the bag on the machine where they will die!