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?
This is the way, but you’re right about hot water. I did damage a pair by accidentally using water that was too hot.
This method minimizes scratching and it does a great job of removing grease (I sweat a lot) that a microfiber cloth would just spread around.