bad odor from tub drain. Home › Forums › Public Forums › General Plumbing › bad odor from tub drain. This topic has 1 reply, 2 voices, and was last updated 21 years, 9 months ago by Retired plbg1. Viewing 1 reply thread Author Posts 6 Dec 2002 at 5:03 pm #276062 MasterPlumbersKeymaster There is a bad odor coming from my tub drain (sewage?). There is no clog, and I have used all sorts of drain cleaners but the smell remains. Any thoughts?? If it is the vent (clogged) – how do we fix it?? Thanks. 7 Dec 2002 at 12:27 am #293353 Retired plbg1Participant Is tere a trap in the line, take overflow out and take out stopper, might be full of hair. Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In