Yup, that’s mold/mildew. While it may seem to disappear after some time in the sun it’s likely still there, just not so visible, and therefore pops back once damp. A good mold/ mildew cleaner like 303 or Star Brite mildew stain remover should be able to take care of it. Spraying with Lysol, waiting a minute, wiping off, and cleaning up with water would also probably work.
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NHskier
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