Best Homemade Shampoo For Oily Hair - Tactile Hobby Apple cider vinegar (ACV) not only helps eliminate tangles and brings the pH of the scalp back down to between 4 - 5 (the ideal range) but also effectively helps to remove residue and natural buildup. Green tea has antimicrobial, antioxidant, and anti-inflammatory properties and, according to Healthline, is effective in reducing serum production.