1. At a request from my own mom take this tip from messygourmet.com to remove tomato stains from plastic Tupperware. You can first put the container in direct sunlight to let the sun bleach out the stain. If that doesn't work completely soak the dish in bleach and it will clean the stain completely. They also suggest soaking the container is very cold water before putting the tomato based food in. It will prevent the stain from happening.
Egg shells
2. Also from messygourmet.com, save your egg shells and break them in to small pieces to help clean a glass bottle or jar. Drop the pieces into the glass container with a few drops of dish liquid and shake to clean.