Maybe this happened before to someone. My M6 grill, the upper part with the mazda badge suddenly discolored in the space of a few weeks. What was black is now a flat gray - like it weathered - there's no black at all anymore, not even on the undersides of the honeycombs for example. Any ideas what might have caused this? Hasn't been exposed to anything that I know of and the lower (honeycomb) grill is fine. thanks
