No Poo Method by No Poo MethodI haven't used shampoo in 2 months! It's now stronger and healthier than ever. Here's how!1/2 cup of apple cider vinegar mixed with 5 cups of water and 1-2 ml of tea tree oil. Rinse hair with this daily and work into the scalp. There will be an adjustment period lasting about 2 weeks. Your hair is used to being stripped by shampoo, so it overproduces oil to compensate. Once your scalp balances out, your hair will feel amazing, and it will stop looking greasy!