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To get rid of pesticide residue and microbes like bacteria on vegetables, you should always wash them well before consumption. Generally, a 30-second rinse followed by a 15-minute soak, and a final rinse will help to remove a significant portion of pesticide residue, said the Agri-Food and Veterinary Authority of Singapore (AVA).
The vegetables should be soaked in a clean bowl as the sink might contain bacteria. Gently rubbing the surface of your fruits and vegetables while rinsing can also help in removing residue. Particular attention should be paid to the base of vegetable stems since dirt or residue tend to get trapped there. The AVA said for vegetables that tend to carry more soil, for example kang kong, the lower portion of the vegetables, including the roots, should be trimmed off before washing.