If you feel like you need to wash your veggies in more than just water, try this recipe from Planet Green:
DIY Veggie Wash
1 tbs organic lemon juice
10 drops grapefruit seed extract
2 tbs baking soda
1 cup filtered water
3/4 cup white vinegar
1. Mix well in a sprayer bottle.
2. Shake before use.
3. Spray produce (except mushrooms, because they absorb and retain water) and let sit for 5-10 minutes.
4. Rinse well