Jazarra,
Graphite comes in many grades and densities. the softer grades will shed graphite dust that may be a/or your problem. You can clean graphite with alcohol or hot water then rub it down good with a soft cloth. You can polish graphite with #000 or #0000 steel wool from the hardware store and burnish with brown papaer bag paper or newspaper. Lots of rubbing LOLOL!
PJH
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