Remove the cover.
Try to remove any hair & gunk manually. I recommend the long plastic tool that is jagged. It's inexpensive and effective.
Pour 1 cup baking soda then 1 cup white vinegar in the drain, cover, let sit 15 minutes.
Pour a pot of boiling water down the drain.
Repeat until draining sufficiently, then place cover back on drain.
Baking soda and vinegar> let work a while> pour in boiling hot water
I used this tool first to see if I can unclog a drain. It works like a charm. https://amzn.to/2Df331I
Hi Alisha: If you can get a really long zip tie, cut slits going down the side, one on the right, one on the left, all the way along to the bottom. Then, tie a string on the top really securely, and tie that around your finger. This will keep it from falling down the drain:) Then, stick it into the drain and jiggle it around and lift it out to see if anything stuck to it. If so, do it a few more times to get as much gunk out as you can.
Then, You will need this:
A small box of baking soda
1/2 cup vinegar
1 quart of water