1 Unclog and deodorize drains To clear clogs in sink and tub drains, use a funnel to pour in 1/2 cup baking soda followed by 1 cup vinegar. When the foaming subsides, flush with hot tap water. Wait five minutes, and then flush again with cold water. Besides clearing blockages, this technique also washes away odor-causing bacteria. • To speed up a slow drain, pour in 1/2 cup salt followed by 2 cups boiling vinegar, then flush with hot and cold tap water.