Ive had it since a teen when I got pneumonia, always assumed it was related to that, however it’s actually this and it’s a perfect description. It a bit of a mind blown moment

Just get a bit of plastic packaging or something similar. Cut thin long rectangle. Then cut a small chunk out near the tip to form a small hook. Scrape along the bottom of the port in all directions. Pull out fluff, then repeat until no more fluff comes out. Then go again as you won’t have got it all out even if it looks like it

Yeah looks like it