The data used to create the Shopper’s Guide are from produce tested as it is typically eaten. This means washed and, when applicable, peeled. For example, bananas are peeled before testing, and blueberries and peaches are washed. Because all produce has been thoroughly cleaned before analysis, washing a fruit or vegetable would not change its rank in the EWG's Shopper’s Guide. Remember, if you don’t wash conventional produce, the risk of ingesting pesticides is even greater than reflected by USDA test data.
EWG has not evaluated various produce washes for efficacy or potentially toxicity. However, since some plants absorbed pesticides systemically, a produce wash would have limited effect. The safest choice is to use the Shopper’s Guide to avoid conventional versions of those fruits and vegetables with the highest pesticide residues.