lol random i know, but i found something that works and everyone probably already has everything you need to do it.
fyi I've only tried this in a tub, not sink, but i suppose it could probably work there too.
first fill the tub up about 6 inches, with the drain stopper in so it fills up.
then take your toilet plunger *you might wanna clean this before you use it* and fill it up with water from the tub
then you open the stopper and position the plunger to where the lips from it surround the drain on the tub and push all the water in the plunger down the drain
do this a couple of times one right after the other and more then likely, as long as you only had hair type stuff clogging it, it should be gone
