If it is just little spots, you can flick them off with an x-acto knife (or carpet cutter). You can also rub just the spot, lightly, with the blade, and it will take off a little dust at a time. The next step after that would be to clean it and then seal it. If you think it looks unattractive as-is, and it's value isn't high (I don't know), then you can certainly restore it somewhat, very easily.
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