Method 5. Deodorizing Your Drain. Pour 1/2 cup (170 g) of baking soda down your drain. Boil 1 cup (236.58 ml) of water in a pot. Add 1 cup (236.58 ml) of vinegar to the pot. Pour the water and vinegar mixture down the drain. Let the solution sit for 10 minutes. Flush the drain with another pot of boiling water. Sometimes as you're staring at a clogged drain or leaking pipe, you wish you had a plumber friend you could call to ask for some free advice. Then you could fix