Facebook user Laura Rusk, shared her advice: “Put a few pennies in a clear bag in water and hang it up.. (you need to change the water every now and then though).
“Flies and wasps think it’s a wasps nest and stay away!”
Laura Rusk said: “I did this today, I hung it in the centre of the french doors into the conservatory, I’ve only seen one fly today, well worth a try!”
Megan Scott recommended: “I put a copper coin on the window sill/ door tread of all open doors.
“No idea why it works but it definitely does!”