Promptly clean the phone if it comes in contact with anything that may cause stains, or other damage—for example, dirt, sand, ink, makeup, soap, detergent, acids or acidic foods, or lotions.
To clean:
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Disconnect all cables and turn off the by pressing and holding the POWER button.
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Use a soft, slightly damp, lint-free cloth—like a lens cloth.
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Avoid getting moisture in ports and openings.
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Avoid using cleaning products or compressed air, which may cause damage.