We’ve all been told eating fruits and vegetables is important. But a new report published Monday by the Environmental Working Group says that even after fruits and vegetables are washed and peeled, some have a high amount of pesticide residue.

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The residue is known to be toxic to the nervous system and can cause cancer. The Environmental Working Group is a non-profit advocacy organization that says its goals include scaling back on federal policies and government subsidies "that damage the environment and natural resources" in favor of "policies that invest in conservation and sustainable development."

This is the list:

Apples are apparently the dirtiest, followed by celery, strawberries and peaches.

The samples were washed and peeled before testing. The rankings reflect the amounts of chemicals on food when it’s eaten.

The cleanest – onions – had the lowest amount of pesticides. Second is corn and third is pineapples. Fourth is avocados.

The report says that washing with a produce wash won’t always remove pesticides because it’s absorbed by the entire plant and found on more than just the skin.

One option is to buy organic, the report says.