How to remove scuff marks from shutters

I am posting this because I've looked and looked on the web to find out how to clean those tiny little gray scuff marks off of faux wood shutters.  Sometimes when I am closing them, my ring will make a tiny mark along the slat.  Regular soap and water, and even a Magic Eraser doesn't easily get them off.  This morning I tried Soft Scrub (without bleach) and with very little pressure, took them right off.  So there you go.