1. Using a box grater, grate the Castile soap bar into a medium course crumb.2. In a bowl, thoroughly mix the grated soap and all the ingredients until a damp powder forms.3. Use 2 tablespoons for a small load of laundry, 4 tablespoons for medium, and 8 tablespoons (1/2 cup) for large.4. Store in an airtight glass or plastic container.