If you've ever looked down your bathroom sink drain and seen what looks like black gunk, you're probably wondering what it is. Well, that black gunk is actually a buildup of soap scum, hair, dirt, and other things that can get caught in your drain. Over time, this gunk can harden and become difficult to remove.
There are a few ways to remove this gunk from your bathroom sink drain. One way is to use a plunger to try and dislodge the gunk. Another way is to use a drain snake to try and break up the gunk. If these methods don't work, you may need to use a chemical drain cleaner to dissolve the gunk.
Once you've removed the gunk from your bathroom sink drain, you can prevent it from coming back by using a drain strainer or hair catcher. These devices will catch hair and other debris before it has a chance to go down the drain and cause a buildup.