Trina provides a detailed review of the Advanced In-Wash Scent Booster in Australian Sandalwood color by Laundry Sauce. She received this product for free in her last order. According to Trina, these scented beads are added to the laundry washing machine drum along with clothes and detergent. The scent is described as reminiscent of clean clothes, which is a positive aspect of the product. However, Trina mentions a drawback - the lack of clear instructions on the amount of scent booster to use. It becomes a guessing game to achieve the desired level of scent. Trina suggests that a good amount is needed for a strong smell on clothes. Overall, Trina likes the product but wouldn't purchase it due to the uncertainty in measuring the scent booster.