Originally Posted by boomeryo
we took our 2018 jayco 212qb to the dump station after camping in it for 2 weeks and when we got back and opened the door the smell was unbearable so I'm wondering if maybe the black tank vent is clogged or something ? Can anyone give me a clue ?
There's residue and debris in it. You have to wand it. The spray ball will not get all of it. Even if it looks clear during the spray ball flush, stick a wand in there. You'll see. Put a clear pipe on the exterior drain to watch it come out. The 4' wand with a propeller spray end works great. I give the spray ball for 5-10 minutes, then it's time for the wand.
I use 1/2 cup of Boraxo and a 1/2 cup of Dawn and 2 gal. of water in a clean tank to start each use. Sometimes, I put a little more in as the tank fills. I also use this combo in the gray tanks.