Step 3 · Apply Baking Soda and Vinegar Solution
If boiling water doesn't work, try a natural chemical reaction. First, remove as much standing water from the sink as possible. Pour about one cup of baking soda directly into the drain opening. Follow this with one cup of white vinegar. The mixture will immediately begin to fizz and bubble. Place a drain stopper or a wet rag over the drain opening to contain the reaction and direct its force downwards into the clog. Let it sit for 15-30 minutes. Finally, flush the drain with another large pot of boiling water.