Maxell CD lens cleaner.
I think this Thing is about 25 years old. I vaguely remember using it with my first CD player, which I got sometime when I was 13. It stopped working a long time ago, because I poorly stored it without it’s proper CD case, thereby damaging the bristles on the bottom of the CD. I guess I kept it hoping that one day I would fix it and keep my CD player in tip-top shape. Well, I no longer own a CD player, and this Thing doesn’t work on mp3’s, so I have no use for it.