To make a homemade mouse repellent, combine 2 tablespoons of castor oil, 6 tablespoons of liquid dish detergent, 1 tablespoon of hot sauce and a minced garlic clove, and apply the mixture to the mouse's entrance into the home. Reapply the mixture after rain, and make a new batch of the mixture prior to each application to increase its effectiveness.
Another option is to add 1/2 cup of liquid dish detergent and 1 tablespoon of hot sauce to a gallon of water and spray the mixture around the suspected entrances to the home. Reapply the mixture as needed.
To repel mice with peppermint essential oil, soak a cotton ball in the essential oil, and place the cotton ball in the affected area of the home. Remove the cotton ball when the scent fades, and replace it with a newly soaked cotton ball.
Alternately, make a spray by combining 2 teaspoons of peppermint essential oil, 1 cup of water and several drops of liquid dish detergent. Spray the affected areas of the home every two weeks or as needed when the scent of the spray dissipates. To further prevent mice in the home, seal cracks and crevices that are 1/4 inch or larger in diameter.