OK, here is a novel idea. This year I had an exterminator spray my house, to quell a wasp and yellow jacket problem. Every year I get imprisoned by bees, they build nests under the shutters, behind the siding, you name it. The chemical he used was called border, I think, it is available only to licensed pest control people. He sprayed the siding, window frames, shutters, hot tub, patio furniture, umbrella, trees and shrubs, and three weeks later, I have not seen one bee. It will supposedly last two to three months, cost about $200. I also took the sides of the tub off when new, and double sided taped vynl screening behind all louvers. This works to keep em out of the cabninet.