On Feb 3, 5:58 pm, (Doug Miller) wrote:
In article om, wrote:

How can I figure out if that's the problem? There's a vent pipe over
my kitchen on the roof but I have no idea how to tell if there's a
problem with it.

You get up on the roof with a good flashlight, and look down it. If you don't
see any obstructions, it's probably good. If you do, remove them.

I tried that but couldn't see that far down...

Should I try pouring anything down there? Hot water, bleach, draino,
etc?