What base is most commonly used to unclog the drains?

The most commonly used base for unclogging drains is sodium hydroxide, also known as lye or caustic soda. It works by reacting with grease and organic materials in the clog, breaking them down and allowing water to flow freely again. Many commercial drain cleaners contain this strong base for effective results. However, caution is needed when using it, as it can be hazardous to handle and may damage certain Plumbing materials.