Shayna, in her video review, tried the Dry Shampoo with oat milk by Klorane on her two-day-old hair. She demonstrated that the product is a powder that needs to be left on for two minutes before brushing it out. Starting from the bottom, she brushed the dry shampoo through her hair, avoiding spraying it directly on the top of her head. Shayna was impressed with the results, noting that her hair looked clean and less oily after using the product. She recommended giving it a try, but advised against spraying it on top of the head as it can be difficult to pat off. Overall, Shayna's review suggests that the Dry Shampoo with oat milk by Klorane effectively refreshes and cleanses the hair, leaving it looking and feeling less oily.