I do meticulously clean my iPad daily !
That could be part of your problem. In the world of optical glass surfaces (telescopes, microscopes, cameras, etc.) the accepted wisdom is that nothing risks scratching a glass surface more than cleaning. You'd have to adopt a laborious (and somewhat expensive) cleaning routine to avoid this risk.
Wiping an iPad over with a microfibre cloth (that hasn't just come out of its original packaging) is guaranteed to cause fine scratches sooner or later, because of dust and grit on the iPad surface or trapped in the cloth.
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