Assuming that you should be worried about them in the first place.
Store-Bought Veggie Washes Don’t Work, But Baking Soda Does
Water can remove some of the pesticides from a piece of fruit, so a basic scrub under the tap will help at least a little. The extent to which this rather lackadaisical method works will depends on the fruit itself; some skins will more readily release the pesticides contained therein. Others, like apples treated with wax for extra shine, will retain them despite your scrubbing. But water’s occasional ineffectiveness doesn’t mean you should waste money on store-bought veggie washes—they don’t seem to work, either. And even if it worked (which it’s not clear that it does), regular soap is liable to seep into the surface.
A recent study in the Journal of Agricultural and Food Chemistry found one better alternative: baking soda. A solution of sodium bicarbonate and water can remove even more pesticides than water alone, provided you have more than a minute to spare. In the experiments, Gala apples that were allowed to soak in baking soda for eight minutes had significantly reduced pesticide residue on the surface, and at 12-15 minutes there were virtually no pesticides left. This is because sodium bicarbonate can help degrade the two types of pesticides used in this study, thiabendazole and phosmet. Other chemicals might not react the same way, so this solution isn’t a guarantee of a pesticide-free snack. It’s just a lot better than the alternatives.