I have tried all the solutions listed here, and only one of them worked: cooking the silicone in a hot oven. A low-temperature oven didn’t work either. But when the oven was good and hot, it worked wonders. Obviously this can only be done when all parts are oven-safe at high temperatures. I removed smells of cigarette smoke and smells of bad food from silicone by simply heating it up and then opening the oven door to let air circulate.
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