Drain cleaner is a chemical product designed to clear clogged drains and pipes. It works by breaking down organic materials, such as hair, grease, and soap scum, that accumulate over time. Common ingredients in drain cleaners include sodium hydroxide, sulfuric acid, and enzymes, which help dissolve blockages effectively. There are two main types of drain cleaners: liquid and gel. Liquid drain cleaners are typically easier to pour and can flow through standing water, while gel cleaners cling to the sides of pipes for more targeted action. It's important to use these products carefully, as they can be hazardous and may damage certain types of plumbing, such as PVC pipes.