Peppermint Oil has many uses from helping the digestive system and stomach aches to relieving headaches, but did you know that you can use it to repel spiders? To make a spider-repellent spray, place about five drops of peppermint oil in a 16-ounce spray bottle. Fill the bottle with water, add a shot of dish soap, and shake the mixture well. Apply the spray around doors and windows, around the outside perimeter of your home, and in any dark corner where spiders may be hiding.