Sewage smell from patent kitchen sink
I noticed our kitchen sink draining slower with a foul odor, so I removed the p-trap and the pipes attached to it, as shown in the red circle. There was a bunch of gunk and oil residue. I used bleach and a hose to clean it and put it back.
After only 2 weeks I noticed it draining slower and water sitting in the tailpiece that connects to the drain. I removed the pipes again, and water was coming from every slip joint nut that I was loosening, instead of just from the p trap. This time I tried cleaning the inside of the waste arm that goes to the vent pipe as shown in green circle. I had to use a cloth as there was a lot of oil residue. I also noticed a slow drip of water coming from this waste arm while it was disconnected. After putting it back together, it drained fine. However, there is now an awful sewage smell emitting from the sink. There are no clogs within reachable distance. I thought maybe I put it back together incorrectly, but it looks the same as in the image. I live in a condo townhouse, and management told me to get a plumber. I think I found the vent pipe on the roof, but I can't reach it to see if it's clogged. I think our toilets, showers, etc are okay. Advice?
