1. Blot up the spill immediately. Don't rub it, as this can spread the stain and make it more difficult to remove.
2. Rinse the container with cold water. This will help to remove any excess tomato sauce and prevent the stain from setting.
3. Fill the container with a mixture of equal parts water and white vinegar. Let it soak for at least 30 minutes.
4. Scrub the container with a soft sponge or brush. Be sure to get into all of the nooks and crannies.
5. Rinse the container thoroughly with cold water.
6. If the stain persists, repeat steps 3-6.
7. You can also try using a commercial stain remover. Be sure to follow the directions on the product label.
Here are some additional tips for removing tomato sauce stains from plastic containers:
* Avoid using harsh chemicals or abrasive cleaners, as these can damage the plastic.
* If the container is dishwasher-safe, you can also put it in the dishwasher on the hottest setting.
* If you're not able to remove the stain completely, you can try covering it up with a sticker or label.
With a little effort, you should be able to remove tomato sauce stains from your plastic containers and keep them looking their best.