Whether your produce is treated or straight from your own organic-method backyard, it's always wise to wash it before consuming. If commercial, washing will remove any chemicals, waxes, or supplements, and if natural, it can help rid your goodies of dirt or insects. A quick spray 'wash' helps save water, plus "most chemicals used on produce won't be washed off with a simple application of water—if they were, they wouldn't be very effective in the face of growing season rainfall."
Apartment Therapy's Re-Nest offers two easy DIY produce wash recipes that are cheaper than commercial products. Check them out here.