Points taken on methodology, don't have enough knowledge to speak much further on it constructively but I would say my intuition is that "stuck to" is not that

Points taken on methodology, don't have enough knowledge to speak much further on it constructively but I would say my intuition is that "stuck to" is not that much different to "absorbs into the outermost layers of" although I would like to know more about what's going on molecularly, and will look into it. I'm also not sure the distinction between PFAS introduction in manufacturing vs washing/distribution is that important to this study - does that distinction matter to the end user of the straw who is looking to reduce PFAS intake? On coatings: If you're a glass factory who has been pumping out say, PFAS coated glass beakers for years and then you decide to get into the straw game, why not coat those too if your beaker customers like the coating? Doesn't seem like much additional cost at 'shipping container scale' if you're running the coating shop anyway. And, I believe polymeric glass coatings can be attached 'for life' these days. Again I'm not an expert but I believe they are applied to smart phones, solar panels, exteriors of buildings, etc. Cynically, a coating doesn't even have to stick around to be important enough to spend money on. Maybe it falls off immediately but just keeps the straws smudge free during packing with 20% less time on washing or something. Given the social understanding to wash new food grade stuff before use, I don't believe is a situation out of the ordinary. I'd like to know more about all this as someone who uses glassware for ingested items - will do more research.