Automatic Dishwashing Soap Source: Casey Kellar, author of Natural Cleaning for Your Home: 95 Pure and Simple Recipes Like Cascade and Sun Light Homemade natural formula will safely cut through grease and sanitize your dishes as well. 1/2 cup liquid castile soap 1/2 cup water 1 teaspoon fresh lemon juice 3 drops tea tree extract 1/4 cup white vinegar Combine water and liquid Castile soap. Stir and then add lemon juice, tea tree extract, and vinegar. Stir until blended evenly and store in a squeeze bottle. Use 2 tablespoons per wash in a standard-size dishwasher. NOTE: Do not substitute conventional liquid soap for the castile soap unless it is a "low sudsing" soap. Regular soaps will produce too many suds and overflow the dishwasher.