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I have a Nano Puff jacket. I was required to wear a round sticker to show that I was screened for Covid at my local hospital. I was able to get the adhesive off the jacket with mild detergent and water, but a dark circular stain remains. Can you advise how to remove this stain?".

rub with a qtip and rubbing alc (don’t soak just light single directional strokes) I had success doing this with a snowboarding sticker on a red Nano. try is in a conspicuous place first.