OK, here's a tried and true method I've used at home, and even around horse stables;
Take a quart sized zip lock back, fill it with water, and hang it near the door.
Evidently this water causes vision refraction due to their complex eyes;
HowStuffWorks "Can a bag of water keep flies away?"
Usually the zip lock is hung by tacks thru the area above the zipper. For your RV I'd use the clothes hangers designed to hang trousers, clamping the plastic above the zipper between the tension bars. Then hang the bag by the hook on the awning arms, etc.
I've tried this. I works. I don't swear by *how* it works, it just does.
I've never put the flakes of tinfoil inside the water, or the penny. Just plain clear water in a ziplock bag.
If age is a state of mind, and I've lost my mind, I'm AGELESS, right?
Give me 40 acres and I'll turn this rig around:
Flagstaff 5er 2014 8528 IKWS
, Platinum Package, Regency Interior "Buffy"
F250 Super Duty 2013
Tuxedo Black "Biff"
Days camped 2014