"recipes" for natural fly spray?

I don’t want to use insecticides on my mare now that she’s in foal. I have heard that skin so soft + vinegar works, but have not had much success with the huge flies we have right now. Any other ideas?

I use listerine and water - 1/2 and 1/2 - I apply in morning and evening.

I have found very few bots as well

Best Spray Ever:

Fly & Tick Control Spray:

You may laugh as this sounds like a salad dressing of sorts.

1 part Malt vinegar, 1 part Listerine mouth wash and 1 part Water and a bit of Baby Oil.

I got the recipe from a very experienced horse lady that lives in an area that is absolutely brutal for horse flies and mosquitoes; she said it worked better than most sprays. I used it on my mare and foal last summer and it worked great. One day they were both running non-stop because of the horse flies. I put it on them and they both stopped running PDQ and had a nap.
It doesn’t last for more than 12 hrs, but works great.

Agricultural Research Service of USDA recently published a report that catnip oil is a good fly repellant.

I use Citronella oil and RepelX sometimes with SSS.

The Citronella replaces the need actually for SSS as a “sticking” agent.