I recently got a 2000 Forest River Sandpiper and it's in pretty good condition, but there are some soft spots in the wooden walls and floor. I live in AZ and this RV has been in dry Arizona for at least a year (if not it's whole life), and there hasn't been a hard rain in months, so I doubt there's any mold, but I'd like to just be sure. I'd prefer not to remove the wallpaper to check for mold. What are some good ways to find out if there is any mold on the soft spots or anywhere else in the trailer?