Bought twice and this is the only microfiber cloth I've been using ever since I got my IPP 10.5 in 2017. The screen is in perfect condition to this date.
I don't use/recommend screen protectors, too. I think they will detract from the original. Remember these newer devices are so good precisely due to this factor:
"Record Low Screen Reflectance and Performance in Ambient Lighting"
Which I don't see how it can be the same with a screen protector.
Note: sometimes the iPAD screen gets dirty and using this cloth in dry condition will not remove the smudge. This doesn't happen often, but when it does I advise to use pure/clean water from your sink - just dip the tip of the microfiber cloth and carefully apply in the screen (never rub hard and only apply into the area affected).
Never use anything besides water when this sort of thing happens.
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I like this idea because those are often sold in portable packs. My new IPP picks up way more dust and fingerprint goo than my Air 2, and while a breath and a quick swipe with a microfiber would clean my Air 2, it takes a lot more than that to clean the IPP.
Be sure to get any grainy stuff off (like sand) before wiping it down. You won’t want to grind the grains into the screen after all. Blow them off or be gentle with them