One of the best parts about a blowout is that you can make it last a few days after the actual treatment — aka, skip the hassle of washing and styling your own hair. Win, win. One of the best ways to extend the blowout without letting your hair turn greasy is to apply dry shampoo to the roots, around the ears, and at the nape of the neck. Then massage it in, brush it down, or blast it with a blow-dryer. Poof. Your hair is perfect again.