This thing does a much better job at cleaning their nano-texture displays compared to a regular, smooth microfiber lens cleaning cloth, so there is actually a reason for it to exist.
That being said, while I haven't tested this, you can get other "suede" style microfiber cloths that I suspect are functionally the same thing as the Apple Polishing Cloth.
Can I wash this myself or do I have to send it to Apple for their proprietary laundering method?
No thanks, I’m Polish already.
Yeah, but did you see the compatibility list? Disappointed I'll need to move to iPhone 5 or higher to use it.
Anyone know if I can use this to wipe a OnePlus 6 device?
I'd recommend flashing the cloth with open source firmware first. Otherwise it might check a signature in the glass, find that it's non-Apple, and become scratchy.