No wonder, Tupperware is the leading brand of plastic containers that holds an edge among other similar brands. It has amazing designs and sizes, to keep literally anything. I am sharing my experience here. Here is one of the most important things to increase the life span of Tupperware lunchboxes. Turmeric or Haldi is the key component in Indian Cooking. If you are keeping Indian food that contains Turmeric, then you need to take extra care otherwise the container gets yellowish stains. Always wash the container with warm water after using so that it doesn’t leave the box oily or with Turmeric stains.