You need to user a wettable powder insecticide, which stays suspended in the air and once finally settled, has a residual effect - I'm not sure for how long, but a
lot longer than the sprays which are really one-shot deals and dissipate very quickly.
Possibly for some types of truly effective insecticides you will need a license, I'm not sure about Michigan; that varies state by state. I don't think you can find the professional grade stuff at your local big box store. Maybe online?
If it's an ongoing problem, it may be cost-effective to hire a professional pest control company, they can also advise you on how best to seal up your house so the little buggers don't get in!
I've been in residential construction for many years and have encountered some truly horrific nests. Including a beehive that was producing so much honey it was oozing in through the interior walls. And another house that was infested with wasps indoors - they had a giant hive in the attic and were coming in around the light fixtures. When I encounter them in the course of a job, I strongly suggest the homeowner hire a professional before we continue work.
Not the basic little outdoor nests - those are no big deal and I eliminate those quite handily. But the bigger, hidden hives - I don't get paid enough to deal with those!
