a group of 12 fruits & vegetables that contain the most pesticides:

Strawberries
Spinach
Kale, collard and mustard greens
Grapes
Peaches
Pears
Nectarines
Apples
Bell and hot peppers
Cherries
Blueberries
Green beans

^ heather dewey-hagborg buys organic versions of these.

and then the clean 15 are the ones that contain the least:

Avocados
Sweet corn
Pineapple
Onions
Papaya
Sweet peas (frozen)
Asparagus
Honeydew melon
Kiwi
Cabbage
Watermelon
Mushrooms
Mangoes
Sweet potatoes
Carrots

https://rawjuce.com/the-dirty-dozen-and-clean-15-your-guide-to-smarter-produce-shopping/