Step 4: Use a plunger to clear the drain.
If the previous steps do not complete the job, use a plunger. First, plug the overflow drain with a wet rag. Be sure to completely block the overflow drain to keep pressure in the pipe. With water in the tub, cover the clogged drain with the plunger and press down with a steady pumping motion. The pressure should loosen the blockage.
 Press down with a steady pumping motion.
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