Remove any visible debris: Before using any tools, remove any visible debris or hair from the drain opening. You can use a pair of needle-nose pliers or a bent wire hanger to reach into the drain and pull out any visible blockages.

1. Boil water: Boil a large pot of water on the stove. Once the water has boiled, let it cool for a few minutes so that it is still hot but not boiling.

2. Pour the hot water down the drain: Carefully pour the hot water down the drain. The heat can help to break down any soap scum or other materials that may be causing the blockage.

3. Use a plunger: If the hot water does not clear the clog, try using a plunger. Fill the tub with enough water to cover the bottom of the plunger, and then place the plunger over the drain opening. Apply firm, downward pressure on the plunger, making sure to maintain a tight seal around the drain. Repeat several times if necessary.

4. Try a drain snake: If the plunger does not work, you can try using a drain snake to remove the clog. Feed the snake into the drain and turn the handle clockwise, pushing it down into the drain until you feel resistance. Continue turning the handle while pulling the snake out of the drain. If you encounter resistance, turn the handle counterclockwise and continue feeding the snake into the drain until the blockage is cleared.

5. Clean the drain: Once the clog has been cleared, rinse the drain with hot water to remove any remaining debris.

Regularly cleaning your bathtub drain and preventing the buildup of debris and hair can help to prevent future clogs.