Best is to soak it in water and caustic soda mixture 4 2 hrs and then clean it with a tooth brush under running water and then leave it in hot water mixed with lemon juice 4 a couple of hrs here u don't need to use soap at all
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There is another method of cleaning plastic sieve, and that is by taking a few soap powder and chlorine in a bowl, soak the sieve for 4 to 5 hrs. After that you can wash the sieve. It looks as new.