Lots of bees behind the upper floor shutters, as I never go around and spray the way I do on the ground floor. I've gone through too much ($$) wasp spray and started reading online.
You take a little spray can (I happen to have)
And you mix 16 oz water, 1 oz liquid dish soap, 1 oz rubbing alcohol.
And spray.
And they drop like they've been hit by a brick
It was unbelievable. Highly recommend soapy water bee spray.