I realize that,,,if you pour the baking powder down the drain then pour the vinegar on top the foaming action causes pressure in the drain pipe pushes the clog thru without burning the drain,especially if you have a PVC drain.
How's thaT FOR A RUN ON SENTENCE?LOL
Not bad! Thanks for the reply. It makes sense now. There would certainly be some pressure behind it.
Ya know, a person could simply bring in a hose, wrap it up using a washcloth to provide a seal to the drain and turn on the hose to blow out the blockage.