To use this trick, start by rinsing your stained container with warm water. This helps to remove any loose debris and preps the surface for the baking soda treatment. Next, sprinkle a liberal amount of baking soda over the stained areas. If the stains are particularly deep, you can add a few drops of water to create a paste.
Once the baking soda is applied, simply let the container sit. There’s no need for scrubbing or any additional effort on your part. The baking soda will do the work for you, lifting the stains over time. After the waiting period, which we’ll cover next, rinse the container thoroughly with warm water and dry it with a clean towel.

5. How Long to Let It Sit for the Best Results

For optimal results, let the baking soda sit on the stains for at least 15 to 30 minutes. This gives the baking soda ample time to penetrate the stains and break them down. If the stains are particularly stubborn, you can leave the baking soda on for up to an hour.