how to clean smudges off an lcd?

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use tape

Best way to do this is with super cheap clear tape-- i.e. the kind you see in an office or use to wrap gifts-- not the larger clear packing tape. Why cheapo brand? Because cheap tape has less glue on it. Lay down several rows overlapping each other-- pull=clean lcd.

Block off lcd in your design as best as possible-- the challenge.
 
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