How do you prepare a roach repellent?

Three common roach repellents that are non toxic to humans and can be prepared at home are: Boric acid paste, baking soda paste, and soap and water. Boric acid paste is three teaspoons of boric acid, three teaspoons of sugar, and three more of water. Baking soda paste is made the same but with baking soda instead of boric acid. Soap and water is self explanatory.