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I've heard that if you first coat the plastic container with olive oil, that keeps the tomato stain away.
Place your plastic in the sunlight to remove stain; it's free.
Use some hydrogen peroxide with your regular detergent. The hydrogen peroxide is the active ingredient in the Cascade Plastic Cleaner.
Make friends with your local Tupperware dealer. It is usually on sale for about $1 if you buy some Tupperware, but you can ususally get them to tack it on an order from someone else who did not want it.
I have also tried the olive oil trick and it works pretty well.
The active ingredient is Benzoyle Peroxide. You can get a quart of that stuff in any supermarket in the Bandaid aile. I guess you could use it straight on plastics, or pour, say 1/2 cup in the dishwasher in the middle of a cycle. I'm going to try it myself.
It's no longer on the market, but maybe if enough people request it, they'll bring it back. Either do a Google (web, not shopping) search for Cascade Plastic Booster, & the first result will be the Amazon page (you can't find it with amazon's search engine). Or here's the amazon.com link http://www.amaz e/dp/B000CEO5AU. There's a link on the right to sign up when it becomes available. Who knows, maybe if Amazon reports that a lot of people are requesting it?
Actually the active ingredient was Benzoyl peroxide. Hydrogen peroxide won't do the same. That ingredient is still available in many acne creams in most drug stores... but not at $3 per container.