Yes, we have it. It looks like mildew. It first appeared during the first year of ownership so we were able to get the Diamond Shield replaced and they repainted it where the shield ripped up the paint. I made sure to keep it very clean and waxed but it has re-appeared. It is under the Diamond Shield and the only way to fix it is to remove the shield.
Stewart, Brenda and kids
2008 Newmar Canyon Star 3410, now at a new home
2006 Roadtrek Versatile 210