I was a fanatic about not touching my LCD at one point. Especially on laptops that have that plastic film - it is simply *difficult* to clean them off without screen cleaner designed specifically for LCD screens (which used to be outrageously expensive, too).
But modern *touch* LCD screens are generally glass - no plastic - no film, and therefore easier to clean even with a dry cleaning cloth and... when the smudging is caused for a purpose, it is less irritating than having someone reach and and point to a place on your screen to leave a single distracting smudge.
It is the downside of a touch-oriented post-PC world. Us A-Type OCD suffers are going to have to deal with a world of smudgy screens going forward. Let go and find peace.
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