I need help to eliminate a sewer smell coming from the sliding door area going upstairs in our fifth wheel. The door is on the opposite side of the toilet. There are no leaks. I have looks underneath ...
Hit up a dollar store and buy some pinesol like ten bottles of it, as mentioned above, get a clear sewer line fitting and dump file rinse repeat until everything is out then dump a gallon or two of pinsol in and leave it for a while.
I do this a few times a season and try to drive with the cleaner in the tank. Downy scent Perls or what ever the are called are good to.