My husband leaves the doors open in the sun room and they come in like they are welcome to be there too. I use windex, hair spray, bathtub scrubbin bubbles, awesome, spray starch. If it sprays I hit them with it. When they fall down I can smash their heads. Guess the animal rights activist would be mad. I have some mouse trap glue boxes out now to see if flies will go into it. If they will it will be an easy way out. If the basil works would you let us know please. I am going to go ahead and put some out.