Step 2: Remove clean-out plug or trap to access blocked drain
If a plunger does not work, find and remove the clean-out plug on the lowest point of the drain, under the sink. Use a plumber's wrench to loosen the plug, then remove by hand. Allow water to drain into a bucket. If there is no clean-out plug, remove the entire curved trap by loosening the couplings on either end of the curved trap. Allow water to drain into a bucket.
 Use a plumber's wrench to loosen the clean-out plug.
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