According to the Environmental Working Group, the ???dirty dozen??? most pesticide-laden fruits and vegetables are: apples, celery, strawberries, peaches, spinach, imported nectarines, imported grapes, sweet bell peppers, potatoes, blueberries, lettuce and kale/collars. The ???clean 15??? are onions, sweet corn, pineapples, avocado, asparagus, sweet peas, mangoes, eggplant, cantaloupe, kiwi, cabbage, watermelon, sweet potatoes, grapefruit and mushrooms.