I got my first M200 recently and I've rapidly accrued a fair amount of posting and closing scuffs. It's a black pen and these scuffs are a minor issue but, if they're easy to remove/reduce, I'd like to know how.

If it's plastic, then a plastic polish like Novus will take care of it. If scratches bug you, try to avoid black as it shows scratches very well. Scratches in almost all materials are lighter than the polished parts so the darker the color, the more they show. Also marbled, swirly, stripy stuff makes it much harder to spot the scratches.

ah... one of those technical terms.

A small amount of plain basic toothpaste works wonders too.

i keep flitz on hand for a number of uses (cleans and polishes chrome beautifully, too). Most of my pens are "swirly" so I don't polish much.

My dentist & his hygienist have told me that, too. But, I refuse to listen to them.