I just had this today at my inspection, so thank you for starting this thread. My first thought was moisture and my clients were concerned. I had no issue peeling back a corner of plastic and checking behind the insulation for any water staining. I was able to place the insulation back and get the plastic tight by using the staple in place. Maybe not ideal, but I got my answer when I saw there was no moisture staining or evidence, so I think it’s safe to say its just dust/debris.
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