How do I clean the drain in the bathtub?

It's probably hair in the drain. Try a Zip-It Drain Cleaning Tool. They are cheap and can be found nearly all stores.

There is a screw on the drain cover where the water goes down. Unscrew and remove the cover. Set the screw on the bathroom counter so you don't loose it down the drain.

First try a coat hanger down the drain pipe and use the curly end if you can get it untwisted from the hook hanger. Or take a pair of pliers and make a small hook on the end of the wire. Now simply stick it down into the drain and turn it around and around and pull it back up and pull the hair off and do that again until it is cleared and water runs down the drain fast.

Or ask your neighbors if they have a 'drain snake auger' or know a neighbor that has one. Or go buy one at Home Depot or your hardware store and just feed it down the drain and turn it around and around and pull it back up and get ready with some paper towels to clean off all the hair and gunk. Run water and it should be cleared. You can get an auger with or without a handle/turner. I would get a simple plastic coated "Drill Snake Drain Auger" that attaches to your electric drill for the big jobs but also does the small ones without the drill. You will have it forever and it is coated, so easy clean up if you ever have a stopped up toilet. It's $20 at Home Depot.

The zip it works amazingly.

Vinegar and baking soda works great

Use the zip it tool, they are cheap and last a long time, mine last for years, actually. You put it down the drain as far as you can get it and pull it out and it will bring out lots of hair and gook. Do this until you don't bring up anymore. Put about a half cup of baking soda down the drain and follow that with a cup of straight vinegar. Let it foam and fix until it quits. Put a gallon of boiling water down the drain to rinse all down the drain and it should be clear. Occasionally if it is really gooky it may take two tries with the baking soda, vinegar and boiling water to really get it cleaned out. All the slimy gook is from soaps, conditioners, etc. that collects on the hair. If you use bar soap, try to go to the shower gels, it doesn't leave as much residual down the drain. This also works on other drains, like the kitchen to keep the drains clean, but without the zip it. I hope this works for you, Morena, it works really well for me in all my drains. I try to do this around every six weeks or when the drain starts to slow down.

I can attest to the fact that this tool works! I go through a lot of them because I clean vacation homes, but which would you prefer to do... pay $4.00 for the tool or hundreds from a plumber?!!

Purchased a zip tool just for this purpose. Found that my tub drain has crazy turns in the pipe and it didn't work at all....Could not get the tool down more than 3 inches........Old house, old plumbing....Finally had son use a short drain auger and go from the other direction...works great now.. Gave the zip tool to my DIL and works great for her and her family.

try drano

Hi Morena, you'll probably find that hair got stuck inside the pipe. Here's an article that will help - https://www.home-dzine.co.za/diy-1/maintain-remove-hair-clogged-bathtub-drain.html#:~:text=First%2C%20try%20to%20pour%20some,see%20if%20the%20trick%20worked.&text=Plungers%20can%20become%20helpful%20tools%20during%20these%20situations.

Hi Morena, hope this helps you out,

https://www.homedepot.com/c/ah/how-to-unclog-a-shower-drain/9ba683603be9fa5395fab9011ecddf8