I’ve had this small cloth for over ten years. It’s a pretty unremarkable glasses cleaning cloth. I found it again recently, 11 years, 5 jobs, 3 cities after it first came into my possession. I put it on the keyboard of my MacBook Air. The manufacturing tolerances on this computer are so small that when you carry it around in a bag the keyboard presses on the screen and often transfers the dirt from the well-used keys onto the screen. This keeps the screen a bit cleaner when it’s crammed into my rucksack for the cycle to the office.