[Hellmark]

The only thing I've ever used on my displays have been things specifically designed for displays or glasses. Even still, I am hesitant to use them, and also use very little. Best thing to do is to use a microfiber cloth dry. If you do need a wet cleaner, put a tiny bit on to a cloth, and then wipe with the cloth. When I've used a wet cleaner on my reader, I used a prepackaged wetwipe meant for glasses, which was mostly water and isopropyl alcohol, and used very lightly. eInk screens are glass based, and mine doesn't have any touch layers, so it is relatively safe. I'd be resistant to try that on ones with touch interfaces, with possible exception of ones with IR touch interfaces.

I work with refurbished VOIP phones at work, and those displays are very temperamental when it comes to cleaning. One of the largest issues I see is someone puts too much cleaner on, it leaks into the side of the display, where it gets sucked up by the substrates of the display. Some displays have corrugated layers, and so their sides act a bit like straws, and draw in the moisture. The other huge issue that comes into play is the coatings on the displays, for antiglare and the like. Those can be eaten or rubbed off, and look like crap afterwards.