How to clean TI-Nspire buttons
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Turn the calculator over so that the blue Texas Instruments logo is up.
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Slide the blue case downward until it is completely removed from the calculator.
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Turn the calculator over and locate the sliding latch on the back of the calculator.
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At the same time, slide the latch to the right and pull the keypad downward. This should completely separate the keypad from the calculator.
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Now that you have detached the keypad, gather the cotton swabs and rubbing alcohol.
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Dampen a cotton swab by placing 1 to 3 drops of rubbing alcohol on the tip.
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Use the moistened cotton swab and rub it around each button, in crevices, and anywhere on the keypad that may have dirt. Replace the swab as often as desired.
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Now your buttons should be free of any stickiness.
Now your buttons should be free of any stickiness.