What do you guys do to prevent mildew on the awning. My last 5th wheel developed a bad case of mildew/stain. I always put it up when it was dry, or opened it up when I got home to dry out. No matter what I do, there always seem to be moisture in the awning when I roll it out. Some of this must come from rain getting inside the front of it when traveling, but sometimes it will be wet even when there hasn't been rain. Is there a spray that can be applied to keep the mildew down? I'd like to keep my new trailers awning mold/mildew free, if possible... 
