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Before trying any drain-clearing methods on a plugged drain, check that the tub's pop-up stopper is opening fully and is free of hair and debris. If the stopper isn't the problem, then the drainpipe is probably clogged. First, try a plunger or chemical drain cleaner.

If these fail to do the job, you'll have to clear the trap with a snake.

Most tubs have a P trap in the drain. In some homes, the tub may have a drum trap in the floor near the tub instead (it will have a removable metal cover and a rubber gasket).
Using a snake in a tub P trap is much like snaking out a sink trap. If you have a drum trap, first try snaking it clear through the tub overflow.
If that doesn't work, bailout all the standing water from the tub.
Then, using an adjustable-end wrench, unscrew the trap cover slowly.
Have rags ready for any water that wells up.
Remove the cover, bail out and clean the trap.
If, after this, water does not well up, snake toward he tub; if water does well up, snake toward he main drain.
If you can't reach the clog from the trap, it's probably deeper in he main drain.