You can reduce your pesticide exposure level by 90% by avoiding the most contaminated fruits and vegetables. You cannot get rid of the pesticides with extra washing or peeling.
This list is from Kelly Dorfman's book "What's Eating Your Child?"
The Red Zone So-So Levels Better Ahhhhh
avoid unless use caution but not the best of
organic perfect the bunch
Peaches Spinach Applesauce Broccoli
Apples Grapes Raspberries Orange Juice
Sweet Bell Peppers Lettuce Plums Blueberries
Celery Potatoes Grapefruit Papaya
Nectarines Green Beans Tangerine Cabbage
Strawberries Hot Peppers Apple Juice Bananas
Cherries Cucumbers Honeydew Melon Kiwi
Carrots Mushrooms Tomatoes Canned
Pears Cantaloupe Sweet Potatoes Tomatoes*
Frozen Winter Oranges Watermelon Asparagus
Squash Fresh Winter Cauliflower Mango
Squash Canned Pears
*Careful when buying canned tomatoes. Buy BPA Free cans or buy the tomatoes in the cardboard box. Tomatoes are very acidic, so the BPA easily leaches into them.
**Most corn is Genetically Modified. You don't need to buy organic corn but you do need to avoid GMO corn. Look at the barcode. If it says 9 it is organic. If it says 4 it is conventionally grown. If it says 8 it is a GMO.