When buying fruit and veggies, always soak them in a 1:4 ratio of vinegar and water to help remove toxins and pesticides.
Leave them soaking for up to an hour, longer with nonorganic apples.
At the end of the bath, sometimes you can even see cloudy like stuff in the water from the skins and waxes, and dirt on the bottom.
Once I did this to blackberries and they were good for 3 WEEKS! That's unheard of with berries & water.
The vinegar is KEY :)