The last people I worked for had a mare that was allergic to fly spray. So they bought the Skin So Soft oil, whether it was a bath oil or body oil I can't remember.
We mixed a small portion with water to dilute it in a spray bottle.(remember to shake before using for obvious reasons)
I hate the stuff, I think it stinks, but it did work. The girl I worked with that was there the summer before told me though to be careful because if used non diluted, hair fell out on some horses. I didn't see that for myself, just repeating.
I DON'T LEAD 'EM AND FEED 'EM, I RIDE 'EM AND SLIDE 'EM.