Lens manufacturers say that anything other than a microfiber cloth will damage the coatings on a lens. But microfiber cloths eventually pick up crap and they look like they're a pain to wash.
How do you keep your lenses clean? Are you using cloth/kleenex or microfiber cloths? If you use microfiber cloths, how do you clean those?
If this helps you, I've washed microfiber cloths in the washing machine before and it never went wrong. I just toss them in with regular clothes. I usually wash cold, but I don't think it makes a difference
None of them are hemmed, because they don't fray. If you're worried about it, try gently rubbing at the edge of it. Threads won't come off in your hand either. Microfiber is just the size of the thread used, these are 100% polyester and completely machine washable.
I've had great luck with the skip the drier cycle option for cleaning the microfiber cloths and sponges I use to wash my car. I think that's what damages sensitive clothing the most.
And always wash everything with the shortest cycle and cold water lol