Spiders Hate Peppermint!! Fill a small or medium-sized spray bottle to near the top with tap water. Add five to ten drops of peppermint essential oil. Do not use peppermint extract or fake peppermint scents. Reattach and seal the spray nozzle. Shake the mixture and open the lid -- if the water smells strongly of peppermint, you're good to go; otherwise, add a few more drops of oil. Spray the mixture in dark corners, inside windows or any other areas where spiders have been seen.