Dishwashing liquids contain cleaning ingredients called surfactants, which help loosen grease and remove food particles from kitchenware. They are designed to be used according to their instructions, including the recommended amount and rinsing procedure. When too much detergent is applied or dishes are rinsed inadequately, some residue may remain on their surfaces.
Swallowing concentrated dishwashing liquid can cause irritation and other unpleasant symptoms. However, this does not mean that tiny traces left after washing automatically create a serious health risk. The important distinction is between excessive chemical exposure and ordinary household use. Researchers have not established that small amounts of dishwashing liquid left on plates cause stomach cancer.
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