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How to unclog a sink
Clear out the blockage with a bent wire hanger.
If you suspect that your sink is clogged with hair or other solid masses, you might be able to fish it out with an old, bent wire hanger.
Straighten out a wire clothes hanger as much as possible.
Bend one end slightly to create a small hook capable of fitting into your sink drain. Slide the wire hanger down, hook-side first, into the drain.