Add 2–3 inches of hot water to the clogged side. The water acts as a hydraulic fluid, transmitting force more effectively than air. Adding a squirt of dish soap can help lubricate the clog.

Place a clean, dry rag tightly into the drain opening of the sink basin you are not plunging. For a better seal, wet the rag slightly and press it firmly over the drain holes (main drain and any overflow opening). Alternatively, screw in a sink stopper if it forms a watertight seal. Without this seal, air will escape through the adjacent drain, and you will generate zero pressure against the clog.

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