A big thanks to all of you who wrote to me. We didn't believe it was a leak, and I am happy most of you believe the same. I will try the mold/mildew cleaner. We spent almost three solid months traveling in it this summer, so I guess at least two showers a day caused the issue. I will know what to watch for in the future.
Agree that the fan in the bathroom is noisy and useless! Our dealer just replaced our awning....had little pin holes....so hopefully it'll be a while before we have to clean it!