To fix a completely blocked bathroom sink, start by removing and cleaning the pop-up stopper mechanism, as it frequently catches hair and debris. If the drain remains blocked, place a bucket beneath the P-trap curve under the sink, unscrew the slip-joint nuts, and manually empty and clean out the accumulated sludge trapped inside the U-bend pipe. Callout type="warning" title="Hygiene Warning": Place a bucket under the P-trap before loosening slip-joint nuts to catch stagnant wastewater. Verification: Reassemble the P-trap and run the faucet to verify proper drainage and zero leaks.
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