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I recall others saying the Glo HD screen had some oddness to it. I've only got an H2O to judge for Kobo, and I've had various eink Nooks over the years. However as long as the dirt look is generally uniform it's likely just the screen.
You can try to get Kobo or whoever you purchased it from to replace it, but without being able to physically examine your Glo HD I couldn't assure you that the replacement would be drastically better.
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