Still have a question? ask your own! Should the sewer block at (c) the responsibility for clearing the blockage will lie with the local water authority. Request an appointment for service today! I'm going to try the baking soda + vinegar tonight, let's hope for a good volcanic unclogging :). How do i use drain out bathroom in a regular bathtub, sink or shower drain? We accept all major credit cards you can pay with paypal choose.