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Another option is to mix small amounts of apple cider vinegar with the animal's drinking water; consuming this solution is known to change the blood pH of the horse, thus keeping horseflies away. Cider vinegar, coupled with essential oils, is also used in home sprays as the sharp odor may repeal horseflies.
Pure Peppermint Organic Oil Spray. Proven to Naturally Repel Spiders. There are many benefits of spraying this liquid as a method of spider pest control as it is a useful, natural and effective way of driving spiders away. But you need to ensure that the smell of the oil is as strong as possible.