The best time to wash your hair depends on your hair type, your lifestyle, and the look you’re going for. A fresh reset: A morning wash clears away sweat and oil that might build up overnight, leaving your scalp feeling clean and balanced. A morning wash clears away sweat and oil that might build up overnight, leaving your scalp feeling clean and balanced. Better volume for fine or oily hair: If your hair tends to go limp or greasy quickly, a morning wash gives you that fresh, fluffy lift that lasts through the day. If your hair tends to go limp or greasy quickly, a morning wash gives you that fresh, fluffy lift that lasts through the day.