There is silicone available with mildewcide in it, but manufacturers don't use it I suspect due to the potential chemical exposures for their employees, above that of the silicone itself.
If portions get really bad, you can remove it and replace with the product mentioned above. But there is not much you can do about it, and don't use bathroom products for mildew removal, many of them will attack silicone and say so on the label.
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