Just rinsing an apple off in water or polishing it with your shirt is not enough to remove pesticide residue, according to research from University of Massachusetts scientists.
In their report, published in the American Chemical Society’s Journal of Agricultural and Food Chemistry, scientists say dunking the apple for 15 minutes in a baking soda solution will do the job. Scientists also washed the apples with tap water and Clorox bleach, but report baking soda was the most effective for removing pesticides.
The study authors do caution though, the baking soda method was not completely effective in removing residues that penetrated into the peel. They say peeling an apple is the most effective way to remove pesticides from the peel.