You can also try automatic dishwashing machine soap. Get a cheap big jug of the gel and fill the drain so your sure the trap is loaded before you go to bed at night. Run hot water then load up with the soap. Let set all night. Flush in the morning with hot water. Other than a physical blockage like a big old hair ball often times soap scum will build up at the lowest point, the trap. Repeat this process a few times. I do this at my house a couple of times a year. My girlfriend does not understand dumping bacon grease down the kitchen sink is really not a good idea.

The snake is the best but be careful. I have a few horror stories as well about using a snake. One time I had a snake bore a hole thru a rotten pipe and not find out about it for 3 months. The tub and sink were draining under the house for all that time. It was nasty!

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79 240D (no name yet) 203K Miles Maple Yellow
98 2500 4x4 HD Dodge 24 Valve Cummins TD
83 Chevy Van (Dead-Trans. shot)