How do I clear up a slow drain in a bathroom sink?

You may need to resort to draino. It’s often hair in the drain in bathrooms and needs tougher stuff to dissolve it.

If it isn’t lasting you may have some serious build up I would try snaking the drain ir take apart and clean before using chemicals. If you have to go chemicals, check out zep line at Lowe’s.

I would try a flexible snake to get out any debris!

https://www.wikihow.com/Clean-a-Bathroom-Sink-Drain

I wrote a post on unclogging drains that might help - https://chascrazycreations.com/unclog-drains-toilets-with-out-plunging/

Can you unscrew or pop out the drain stopper? Then you can scoop out whatever is clogging it.

I would try a snake before I would resort to the chemicals. They also make a smaller tool, too, as snakes can be hard to manage.

When Draino doesn't work on ours after a couple of attempts, my husband will snake it!

And it never will last neither. Use Drano or Mr. Plumber. But after you do it, You need to learn a good habit of using a plunger on your drain at least twice monthly. It's easy. And it fixes any clog.

Hello,

Where does it drain out too? Is there a blockage in the drain or gulley that can be removed? Maybe the Waste trap under the sink is clogged up somehow. Unscrew it and release the mess, don't forget to place a bucket or bowl under to collect water. If all else fails call a plumber! Best wishes...