Before diving into the "how," it is important to understand the "why." Commercial drain cleaners often contain sulfuric acid or lye, which essentially burn through clogs. While effective, they can damage old pipes, ruin finishes on fixtures, and create toxic fumes.
You will hear a fizzing and bubbling sound—this is the chemical reaction in action. It is crucial to . You want that expanding foam to push down through the pipes to dislodge the clog, rather than bubbling up into your sink.
The best way to unclog a drain is to never let it clog in the first place. Once your drain is clear, make the "Baking Soda Flush" a monthly habit. Pouring 1/4 cup of baking soda followed by hot water once a month can keep your pipes smelling fresh and prevent the slow buildup of grease and scum.
