Depending on your setup, maybe it has been bumped to the second page already. Maybe 2 tbs. I do not use plasticware for tomato based foods. More and more I use glass dishes. Keep foods cold and go into the dishwasher.
Plastic ware is great for taking potato or macaroni salad to a picnic, but that's about it.
To keep your tupperware free of tomato stains, spray or coat the tupperware with oil. Wash your tuppeware. Set it out in the sun for a while. Before posting a message, please be sure you are in the appropriate category. No advertising is allowed on HGTV's message boards.