I've done this a few times cutlery in the dishwasher and it looked no more shiny, but the surface had changed completely. It now looks like roughened or polished. The metal dissolves in the dishwasher at 50 C. simply from. Villeroy & Boch "Made in China" cutlery can be qualitatively forgettable. With WMF and capercaillie is more something not yet happened. I have normal Classic dish washer tablets of finish used.