I don't have this device, but the "flat" microfibers tend to just smear around for me too. I use a microfiber cloth made for screens, one that's actually kind of "fluffy" so it can really pick up dirt... works great for me on any screen (including netbook, phone and ereader).
For extreme cases I add a bit of TFT cleaner fluid, although you have to be very careful with those - many are low quality and smear. So you should use a quality brand. See if there is a TFT/TV review site or forum or something that also recommends cleaners.
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