1. Cause of red stains
Red stains on plastic containers commonly come from tomato-based sauces and curry dishes. The key culprit is lycopene, a natural pigment in tomatoes, along with other oil-soluble pigments found in spices. These compounds are particularly sticky and tend to embed themselves in the porous surface of plastic.
Plastic containers have microscopic pores that expand with repeated heating and cooling. These pores trap the pigments, making stains difficult to remove even with repeated washing. Older or frequently used containers are more susceptible due to this pore expansion.
2. Baking soda use
Baking soda is the simple, effective ingredient that can lift these tough red stains. It acts as a mild abrasive and has natural whitening properties that help remove stains without damaging the plastic surface.
To use, sprinkle a generous amount of baking soda directly over the stained areas of your container. You don’t need to measure precisely, but be sure to cover the stains well. The treatment requires some patience, as the baking soda works gradually to lift the pigment.
