I have had all of my houseplants outside for the summer as I do every summer but later in the season this year I have had a white fly problem in the gardens. Does anyone have any suggestions on how to rid the houseplants of these pests before I bring them back indoors for the winter. I am in zone 5, and from what I am reading the white flies will not overwinter outdoors in my here. I really do not want to bring them inside and give them a nice cozy place to overwinter in my home.