For bathroom sinks the most common problem for a slow drain is a buildup of hair, toothpaste, soap, gels and lotions. Most of this will start to accumulate on the popup and in the trap.
With this little drain tool, you can unclog a bathroom sink with a simple push and twist motion. The tool will pass through the popup without having to remove it. You can push it into the trap to dislodge any build up there. It's easy to do and no dangerous chemicals.
Using a drain tool like this is an easy fix to unclog a bathroom sink drain.