Naturally repel bugs from your home using Spark Naturals essential oils. Most popular: Cut down on the flies in your home– spray a mix of 8 oz water and 10 drops peppermint, 10 drops lavender, 10 drops orange, and 10 drops patchouli around the windows and doorways in your home. Or you can also diffuse to keep flies away with this diffuser blend: 2 peppermint, 2 lavender, 1 orange, and 1 patchouli.