I have a 9.7 Pro and wash my hands with warm water and soap and use a microfiber cloth to clean off the screen and it's spotless.
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Yeah you really shouldn't use alcohol or any fluid to clean the screen... the reason microfiber cloths don't work for you is because you got rid of that oleophobic coating from the alcohol.same problem. i have an Air 2, and a Pro 9.7 and the pro holds on to the smudges way more than my air2. as others mentioned, likely due to new coating for less reflection and pencil support.
i don't use the pencil or my ipad outside much, so i honestly prefer my ipad air2.
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I use alcohol too. microfiber cloth alone works on other devices, but on IPP it just smears the oil around. so whatever oleophobic coating they put on their isn't doing a very good job anyway. so i'm not bothered it gets stripped. alcohol works.