If the stain persists despite using baking soda, try repeating the process. Sometimes, a second application is necessary for deeply ingrained stains. You can also try combining baking soda with a few drops of dish soap to enhance its cleaning power.
If all else fails, consider filling the container with warm water and adding a few tablespoons of baking soda, letting it soak overnight. This extended exposure can help to lift even the most stubborn stains.

10. Smart Ways to Prevent Future Stains Before They Happen

To prevent future stains, consider investing in glass containers or using plastic containers with a non-stick coating designed to resist staining. Alternatively, you can apply a thin layer of oil to the interior of plastic containers before storing staining foods, creating a barrier between the food and the plastic.
Another preventive measure is to immediately rinse containers after use with warm water, reducing the amount of time the staining agents have to interact with the plastic. This simple habit can go a long way in keeping your containers stain-free.

11. Other Low-Effort Kitchen Stain Hacks to Try Next