Was just listening to the carpenter bee issue @ChrisMWilliams was having. I have had the same issue on my pergola and other insects around the house perimeter/basement. A product many professionals use can be purchased on Amazon and you can solve the problem yourself with a hand pump pressure sprayer + wand.
The product is Demon Max which is made by Sygenta and can be purchased on Amazon. It works AMAZING !
The product is Demon Max which is made by Sygenta and can be purchased on Amazon. It works AMAZING !