We purchased an older fifth wheel to use as a sleep camp. There is this musty/bad smell that is more prominent when I open the cabinet door under the bathroom sink as well as the cupboard under the k...
I too recently purchased an old 5th wheel. Had been parked and not used for 10 years. It too had a musty/bad smell. I purchased one of these, and left it in the 5th wheel for about a week. No more bad odor.