If you know you’re skipping a wash and your hair’s going to look lank in the morning, instead of doing a rush job with the dry shampoo the next day, spritz it in the night before. Rub it into your roots as normal then hit the hay, sleeping on it will allow it to absorb and do it’s job even better, and you’ll wake up with hair that’s good to go. Batiste £2.99 is the steadfast classic.