The Clean Fifteen identified are conventionally grown produce with the lowest pesticide levels. Pineapple, sweet corn and avocadoes top this year’s list followed by papaya and onions. The other clean samples include frozen sweet peas, asparagus, cabbage, cauliflower, watermelon, mangos, bananas, carrots, mushrooms and kiwi. Nearly 60% of the Clean Fifteen had no detectable pesticide.