I don't see what you mean about the reflection, but I do see some smudges above the "esp". I've never done any post-scan cleanup, but I do clean the scanning surface with some glass cleaner and a soft cloth when I start to notice markings.
I agree about 600 dpi. We really don't need anything above 300 to document the scans at a readable letter. Anything above that will just catch fine details of the paper and imperfections in the printing process.
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