Let’s make a simple homemade shampoo using natural ingredients. Same Castile soap — different job. This is a shake-before-use shampoo, made without thickeners or synthetic fragrance, and designed to gently cleanse the scalp without stripping it. Simple Homemade Shampoo Recipe Ingredients (and why they’re here) 8 oz Aloe Vera Juice – This is the base, and it keeps the shampoo gentle and soothing on the scalp. 2 oz Liquid Castile Soap – This is what actually cleans the hair and scalp without harsh