However, the limitations of this method must be acknowledged. While the fizzing action is vigorous, it lacks the density and specific gravity of commercial foam cleaners designed to coat the sides of the pipe. Furthermore, because the reaction happens so quickly, much of the gas escapes up through the drain rather than pushing down against the clog. If the blockage is dense—comprised of hair matted with soap scum, a common issue in shower drains—the mild abrasive action of baking soda and the weak acid of vinegar are often insufficient to break the bond. In these scenarios, mechanical removal via a drain snake or zip-it tool remains the superior option.
Using for a shower drain is a popular DIY maintenance method known for its natural cleaning properties and effervescent action . While often touted as a "miracle" fix for slow drains, it is most effective for routine maintenance and minor soap scum buildup rather than heavy hair clogs. How to Use Baking Soda and Vinegar in Your Shower baking soda and vinegar shower drain