what is your best recommendation for a home-made, most effective fly spray for horses?

Just looking to find something that is effective on the horse, but not as costly as the retail brands and safe for environment. Thanks.

tempstress98 years ago
I got this recipe from my riding club. 1 cup skin so soft 2 c white vinegar 1 T eucalyptus oil (from a natural foods store) 1 to 3 c water (3 c to repel) mix in spray bottle, shake before using I made this, but then it got cool and I havent used it yet. Supposed to be good for people too. Hope this helps. Tempstress9
Would you really trust your horse's health to a recipe given to you by someone on the Internet ?