I've had a clogged drain in my bathroom that's been annoying me. I pulled out all the yucky gunky stuff and tried this trip from Martha. Worked great!
DIY Drain Cleaners
Healthy Home 2008
Pour 1/2 cup baking soda, followed by 1/2 cup white vinegar, down drain, and cover with a plug or rag. The mixture will work to break down any fats into salt and harmless gas. Flush with boiling water.
To prevent clogs, make sure your drain has a screen that keeps out solids. In the kitchen, never pour fat down the drain. In the bathroom, brush hair before getting into the shower. And go easy on soaps, shampoos, and especially conditioners and products that contain oils.