Originally Posted by denali15
If you have fantastic fans, make sure to turn them off while emptying your sewers.
They pull in a lot of air and can bring the sewer smell into the trailer.
If this doesn't work and it SHOULD....
My toilet seal was off, when the tank would get full it would then leak into the belly of the RV and the smell would last for a day or 2 until it dried up some. Just "reset" the toilet with a new seal if that's the problem.