What is the best repellent, candle, or spray for flies?

Question

I'm having BBQ this weekend and last time the flies ruined it.

Answer 1

Hang some cotton balls on thread on sticks or the eves and rafters of the patio.  They think the cotton balls are spider webs.  Hang a few above the doors and window openings.  It really works.

Answer 2

umm..try citronella or get a fogger

Answer 3

hang fly tape around the perimeter of where you will be having your BBQ- high enough so they don't get stuck in someones hair and far enough away from food that people don't see them while they are eating. It's better than the chemicals you would be treating the area with and they are very inexpensive.