Pour 1/2 cup baking soda and then 1/2 cup of vinegar. Cover up the drain during the crazy chemical reaction. Wait 15 mins and pour a pot of boiling water. It totally clears up the clogged drain and it's easier on the pipes than Drano. Works every time!!
ONLY use this and it leaves floor spotless. (Heavy duty floor cleaner recipe: ¼ cup white vinegar 1 tablespoon liquid dish soap ¼ cup baking soda 2 gallons tap water, very warm.) It leaves everything smelling amazing.