I use a microfiber cloth similar to the one provided with the reader. I another post I tell about how I watched a fly walking over the screen and turning pages...I gathered that the IR array is pretty sensitive.
For this reason I would like to design a cover that includes a small pocket for a cloth, receipts and notes.
If you use a microfiber cloth DON'T throw it in the dryer with other clothes--especially with a dryer sheet. It will soak up the lint and softener and leave nothing but smudges.
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