If you have a clogged shower drain, you can try using a drain plunger. Cover the drain with the plunger and plunge up and down vigorously to create suction and dislodge the blockage. Another option is to use a drain snake or a wire coat hanger to physically remove the obstruction. If these methods don't work, you can use chemical drain cleaners as a last resort. Remember to follow the instructions and use protective gloves.