We have a bad smell coming out of utility sink (which is near kitchen, so it hurts). I suspect the vent going to the roof. The vent has no cover and has a 3" wide opening. Then it narrows and turns a little inside the attic.
I cliembed the roof today and used some hose (compressor hose, no air, just hose) and stuck it "in there" and wiggled. It did feel like there was an obstruction. I think that I pushed it down a few feet, not yet sure whether it went down far enough to be cleared. Time will tell if the smell diminishes.
My question is, how to properly deal with such obstructions.
i