Chemical Drain Cleaner: Why Your Sink Remains Clogged Despite Multiple Uses

A slow-draining sink or one emitting bad odors often leads to pouring chemical drain cleaners. However, if the problem recurs after multiple uses, it indicates the clog has not been fully removed, often due to buildup in the siphon. Disassembling the siphon can reveal hair, soap, and residues stuck to the walls, obstructing water flow. Chemical products are not always effective, especially with old or strongly adhered deposits, and mechanical cleaning may be required.