All I've ever had to do on my touch screen PRS650 was to breathe a hot breath on it and use a microfiber. That gets rid of any spots or blemishes I've ever had on it.
On my laptop's LCD, I just tab a little water and go to town with a microfiber. Any time I've seen an LCD cleaner, it left a lot of residue. Witnessed a brand new iMac get tarnished that way. Why bother, and waste money?
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