Best Shampoo For Product Buildup: Ouai Detox Shampoo If your scalp is one big pile of beauty products, we've been there. Give hair a reset with the new Ouai Detox Shampoo ($30). It deeply cleanses and clarifies — thanks to apple cider vinegar — while hydrolyzed keratin adds softness and shine. Image Source: Getty Ouai Detox Shampoo $30 from sephora.com Buy Now