Current weather and delay conditions for (GRU) Sao Paulo-Guarulhos International Airport Conditions
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.
To make a dish soap spray, take an empty spray bottle and add 4 tablespoons of dish soap, 2 cups of white vinegar to it, then add 1 cup of warm water, shake the mixture and your dish soap spray is ready. Spray it on horse flies and watch them dying instantly.