I have a 2005 Mandalay 40B and have owned since 20,000 miles, has 34,000 now. It has always had a bit of a sewer smell when driving. I do not run with vents open, both tanks have been bleached but o...
If you use a fabric softener like Downy in your tanks, it will foul up any sensors you have in there. Not a good idea...use Calgon solution, baking soda and water, or a bottle of good old hydrogen peroxide, but not fabric softener....Dennis