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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.
Basic Recipe. Make a homemade horsefly repellent by mixing a pint of white vinegar with 2 ounces baby oil and a squirt of dish soap in a spray bottle. Apply to skin or clothing when outdoors near areas of horsefly activity.