It totally works! I used it on my favorite alpaca/merino wool sweater that was COATED with pills. It took me an hour or so and when I finished I had a fist sized pile of fluff, but then I washed my sweater and it looks brand new! I've since used it on some of my sweaters and have found that it works well on some (particularly cashmere) and not so well on others (cheap wool). You have to be a little aggressive with some types of sweater materials and I would recommend doing a small test patch before trying it on the entire sweater.
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