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Use vinegar as a natural fly spray for your horse. You can use 2 cups of vinegar with 1 cup of water and 1 cup of Avon Skin So Soft bath oil mixed with 1 tbsp. of Eucalyptus oil. You can also add a tbsp. or two of citronella oil to this mixture. Shake it well and then spray on your horse.
Homemade fly spray recipes that may work for you and your horse. U.S. Forest Service Bug Spray Recipe. 1  1 cup Water. 2  1 cup Avon Skin So Soft Bath Oil. 3  2 cups vinegar. 4  1 tbs.