Great question — answering as the UphillTech team:
In my experience, it's the quality of the shirts. I had it before with cheap polyester shirts. If it's more like dust and less like lint, it helped for me to put the shirts together with microfiber cloths in a dryer. The "dust" was afterwards attached to the microfiber, I guess due to its static. Some websites also suggested to wash them with white vinegar, but I personally did not try it. For actual lint, like little "wool" balls, my mum taught me to shave the clothes by simply using a disposable razor, or you can also buy lint and pilling remover. Just slide carefully over the fabric with the shaver, this will remove it. Hope this helps!
Full answer by Hannah: https://lifehacks.stackexchange.com/a/24966 (CC BY-SA 4.0).
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