Curiously, I have never had problems with dishwashing detergent . But never put some bakelite or plastic buttons from TV or radio in a dishwasher because it's too hot . I let them soak in a big bowl of hot water and dishwashing detergent only when I'm in no hurry. Otherwise I clean each button in warm water and dish detergent and an old toothbrush or denture brush simply. Yes of course I let it soak for a few minutes.
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