I use Zaino products on my black gloss Focal Sopra 2's. In particular I use their grand finale spray seal to remove dust on a regular basis with a soft cotton cloth. I use their all-in-one about once a year to give the finish a nice coat of protection, these products make the surface a very slick. I only handle the speakers with white cotton gloves if I need to move them. So far I have only had one scuff mark on one of them, which came off with Zaino fusion polish. They make good stuff, I have been using Zaino on my automobiles for probably 15 plus years. Right now I am looking into a ceramic product, the only problem is there are so many out there it is hard to weed out all of the junk, I have tried a couple that were just that.