Besides brushing them with natural toothpaste like Tom’s of Maine, the google book below recommends brushing them with baking soda or soaking them overnight in white vinegar. Vinegar and/or baking soda are usually a good bet for loosening gunk on plastic or metal. I once had an old stainless steel thermos with years of coffee and tea stains on it. I soaked it in baking soda mixed with hot water and the stains started lifting off. Amazing. However, I would not recommend using hot water with your retainer because it may disfigure them.
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