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With an IR touch screen, there is really no need to press it down hard enough to leave a fingerprint since the screen does not care how hard you press, the length of the tap makes a difference though.
I don't know about Sony but I wouldn't recommend using any "cleaning solution" to clean the screen, it could damage the display coating or cause discoloration. Just wet a soft cloth with clean water and wipe the dirt off once in a while should be sufficient.
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