How to remove spaghetti sauce stains from white plastic?

You know, that orange grease that just doesn't want to come off. Somehow, it wound up on a Pampered Chef deviled egg carrier/server. Those are so expensive, I would like to solve the problem. I've soaked it in Oxy Clean, with denture tablets, scrubbed it with Comet, baking soda, lemon juice and salt, Purple... show more You know, that orange grease that just doesn't want to come off. Somehow, it wound up on a Pampered Chef deviled egg carrier/server. Those are so expensive, I would like to solve the problem. I've soaked it in Oxy Clean, with denture tablets, scrubbed it with Comet, baking soda, lemon juice and salt, Purple Power degreaser, Kaboom, even Didi 7! I've gotten it lightened up considerably, but I borrowed it from my step-daughter, and I'd like to return it looking pristine. Appreciate any (safe) suggestions. Serious answers, please. Thanks!

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