This FlexiSnake is great for sinks and showers in which the water takes forever to go down, plus it's reusable — just clean with hot water and soap after each use.
Promising review:"I tried every drain cleaner known to mankind in an attempt to clear my bathtub's drain and nothing worked. Seriously dudes, NOTHING worked. After reading the reviews on this I figured what the heck, let's give it a try. I wore elbow-length rubber gloves and a medical face mask; I was ready for battle (I highly recommend you do this as well because the splash-back is REAL and it smells of demon butt). After shoving it down the drain just once the most god-awful-looking sea monster of a stinky hair clump came out. I did it about a dozen more times until no more hair monsters came up. I turned on the faucet and that sound of water finally draining through the pipes was like angels singing the Hallelujah choir. That pipe is CLEAR, my dudes! I can finally take showers again without feeling like I'm standing in a goopy stank pond!" —Kayla Cooper
Get it from Amazon for $5.28.