Years ago there used to be a product called vapona strips. You left them in a room and all the flying insects died within about half an hour. We used to use them in our motorhome and they did a great job. When they disappeared I did some research and found out that they were off the market because of a cancer risk. Since then nothing really seems to work. It's the same when we are outside having a bbq. They love citronella. I would love to know if anybody has any real good tips that actually work.