Lenor In-Wash Scent Boosters give up to 12 weeks of freshness to the laundry. Pour the fragrance beads directly into the drum, then add your detergent as usual. The clothes stay fresh for up to 12 weeks when stored. Adjust the scent intensity by using more or fewer beads. Perfect for towels, everyday clothes and bedding. Can be used for all colors and textile types - even in a cold wash.