Has anyone had a clogged plumbing roof vent pipe?

First of all I would check the pilot lights/stove knobs on the stove. I had one bumped on and thought it was the gray tank smelling. Turned out to be propane coming out from a stove knob that got bumped to the on position and the propane was finding its lowest spot behind the stove and into the sink.

Are all your p-traps filled with water? That water can evaporate and allow smells up thru the drain.

If all that checks out ok. It could just be a stinky gray tank. Yes, they can smell awful and fill the RV with a smell. Depending on all what food stuffs and grease you allow to go down the sink and how often you clean it or don't.

I pour one quart of lemon cleaner found at any grocery store every other time I dump the gray tank. Quart of lemon cleaner is around a whole dollar at Winn Dixie stores.

Is the smell a "sewer" smell or an "ammonia" smell? Different fixes for each.

Lakeside

I did find a wasp nest clogging my thru roof vent. I was on a ladder, removed the vent cap, and found the wasp nest. Without thinking I reached in and removed it, and I was very grateful that it was empty. What could have gone wrong?

It could also be something like this that has failed, and needs to be replaced.

Under Sink Vent

Edit: Me Again beat me to it.

The kitchen sink may have the interior vent at the top back of the cabinet, and you have a stinky tank and the valve is letting odor escape! Chris