Doubtful that it is mildew, especially in a freezer. The teflon coating of the tray can flake off after some years and it ends up in the ice. And ceases when the liner is all gone (but the cubes probably won't pop out of the tray like they should).
Or if you have a water filter in line with the ice maker water feed, it can do what Cousin Ed describes.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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