Make a Homemade Apple Cider Vinegar Rinse to Beat the effects of Hard Water on Hair - A vinegar rinse will not only remove buildup from your hair, but also give it bounce and shine! Mix 1/3 cup of apple cider vinegar with 4 cups of distilled water. First shampoo your hair and rinse well. Apply the mixture, leave on for a few seconds, and rinse with cold water. There’s no need to condition afterwards. Due to the acidic nature of vinegar, use this rinse only once a week.