They may have pesticides, bugs, and dirt so yes, let's wash them. Here's how: * On the day you're planning to use them gently rinse the blueberries and strawberries in a strainer under cold water. Shake off the excess water. * Spread the berries onto a baking sheet lined with a clean dish towel, then let them air-dry. Occasionally roll the berries around with your fingers so they dry all over.