Apr 26, 2016 A marble polishing powder is the best and easiest method to remove these etch marks from polished marble. We recommend using MB stone cares MB-11 marble polishing powder because we have used it successfully many times and is well recommended on amazon and marble specific third party sites from around the world. Nov 10, 2021 All shelf clips are different, so install yours based on the packagings specific directions. Just be sure to use a level throughout to maintain a straight surface, as you would hanging a picture frame. Once the clips are screwed into the wall, slide the stone in and tighten the bottom screws to secure the marble.