I really like Bronco fly spray and have always found it to be particular effective here in Texas during the peak fly season. LOVE that I can get a gallon of it from Corro delivered right to my door. Beats lugging it around a tack shop and then to the barn. I’ll have fly spray for months!
I find Bronco fly spray to be effective yet not too harsh as other sprays. And it works, too. I always have a bottle or two or three on hand. You can't go wrong with Bronco.