5 Drain Cleaning Mistakes That Make Things Worse

Reaching for Chemical Drain Cleaners First

Liquid drain cleaners like Drano work by generating heat through a chemical reaction. That heat can soften or warp PVC pipes over time, and repeated use accelerates deterioration in older metal pipes. More importantly, these products often only partially dissolve a clog — pushing it further down the line where it combines with more buildup and creates a larger blockage. Save the chemicals for a last resort, not a first step.

Plunging Without Covering the Overflow

A sink or tub has an overflow port — typically a small hole near the top of the basin. If you plunge without covering this opening with a wet rag, air escapes through it and you lose the pressure needed to break the clog loose. Cover the overflow, then plunge in smooth, steady strokes.

Using the Wrong Plunger for the Job

Cup plungers are designed for flat-bottomed sinks. Flange plungers have an extended rubber lip specifically shaped to seal around toilet drain openings. Using a cup plunger on a toilet or a flange plunger on a flat sink drain reduces effectiveness significantly. Keep one of each under your sink.

Ignoring a Clog That Keeps Coming Back

If the same drain clogs repeatedly — even after clearing — there's a reason. It could be a partial blockage deeper in the line, a grease buildup coating pipe walls, a root intrusion in a main line, or a design issue with the drain slope. Repeated clogs that respond briefly and return are a sign that a camera inspection and professional cleaning are worth doing.

Waiting Too Long on Slow Drains

A slow drain doesn't become a full clog overnight, but it does if ignored long enough. Addressing sluggish drainage early — before a full blockage occurs — is almost always simpler and less expensive. A drain that's taking 30 seconds to clear isn't urgent, but it's worth scheduling soon.

Common Questions