I remove scuffs from matboards by wetting a Q-tip with some distilled water and wringing it out so it is moist and swiping it the length of the scuff. I let it dry and, usually, it is gone. If not completely gone, I'll swipe again. Swiping is lightly done verses rubbing or scrubbing.
A scuff is a slight burnishing of the fibers and slightly wetting it raises the fibers. Most times it works just fine.
Grease (oily fingers), on the other hand SOMETIMES comes out with a little unseal. Usually not, tho. At that point, I figure I've already ruined it so I might as well experiment on it.