Rosemary Rinse for Oily Hair: 1/4 cup dried rosemary. 1. Simmer rosemary in 1 1/2 cups of water; 2. Strain mixture and discard rosemary; 3. Use remaining mixture as the final rinse after shampooing .Or mix 2 cups of cider vinegar,2 oz of lavender buds, 1 tablespoon of glycerin, 10 drops of rose geranium essential oil.Heat the vinegar to just below boiling point. Remove from heat and add the lavender buds.