Tomato stains can be a pain to remove, especially from plastic. The acid in tomatoes can cause the stain to set quickly, making it difficult to remove later. However, there are a few simple steps you can follow to get tomato stains out of plastic.
The first step is to blot up as much of the stain as possible with a clean cloth. Do not rub the stain, as this will only spread it around. Once you have blotted up as much of the stain as possible, you can start to treat it.