You can pick up the droppings or hang fly traps to help.
I’m sure many many people have hung fly traps up with no issues, me personally I am scared to use them again. When our chicks were about 8 or 9 weeks we had a fly trap fall down and stick to a hens neck/back. She was no worse for the wear and was proudly strutting around with her new sticky feather but her grandmother had a panic attack when she found her and brought her to me at work to get it off!!! Lol Lizabeth the hen was not happy about it being removed and I swore no more fly traps anywhere near the chickens! Lol