Easy ways to remove stubborn stains from plastic containers
By Katemarthason Okudo, June 3, 2026Plastic food containers are useful in many homes because they help store leftovers, packed lunches and prepared meals. However, after repeated use, they often develop stubborn stains, especially from foods such as tomato sauce, curry and stews.
These stains can make containers look old and unclean even after they have been washed.
The good news is that there is a simple household trick that can help restore their appearance. Using warm water and baking soda is an easy and affordable way to remove stains without relying on harsh chemicals.
Why plastic containers get stained
Plastic is slightly porous, which means it can absorb oils, colours and food particles over time. Foods rich in natural pigments and oils can leave marks that ordinary washing-up liquid may not completely remove.
According to cleaning advice from household experts and information, food residues can settle into the surface of plastic containers, making stains harder to remove if they are left for long periods. This is why containers used to store tomato-based foods often develop an orange or red mark.
The warm water and baking soda method
One of the easiest ways to tackle these stains is by using baking soda and warm water. Start by rinsing the container with warm water to remove any loose food particles.
Next, add two to three tablespoons of baking soda to the container. Pour in enough warm water to cover the stained areas and stir gently until the baking soda begins to dissolve. Leave the mixture to sit for at least 30 minutes. For tougher stains, it can be left for several hours or overnight.
After soaking, use a soft sponge to scrub the inside of the container. The mild abrasive nature of baking soda helps lift stains without scratching the plastic. Rinse thoroughly and wash as usual before allowing the container to dry.
A report noted that baking soda is commonly used in household cleaning because it helps remove stains and neutralise unpleasant odours.
Extra tips for better results
To prevent future staining, consider rinsing containers shortly after use instead of leaving food residue inside for long periods. Storing highly coloured foods in glass containers can also help reduce staining.
For containers that still have lingering smells, a fresh baking soda solution can help absorb odours. Some cleaning guides from Good Housekeeping also recommend allowing containers to air dry completely before storing them, as trapped moisture can encourage unwanted smells.
While plastic containers may not stay looking brand new forever, regular care can keep them cleaner and fresher for longer. A simple mixture of warm water and baking soda is often all it takes to remove stubborn marks and give well-used containers a cleaner appearance.