Dull thread alert- how to revive my tupperware?

[lizardqueenie]

Slapping myself on the forehead for posting about something sooooo dull, but some of the little tupperware boxes with ladybirds etc on I use for DD's packed lunch have gone a bit orange in the dishwasher, I expect from being put in at the same time as something with tomato sauce.

Is there anyway to restore their whiteness as I quite like them? I'd hate to ask anyone this question in real life.

Denture cleaning tablets should sort it. Soak overnight.

I thought they always go orange eventually... Mine do :)

Seem to remember it's something to do with detergent levels.

Thank you. Some good tips there. Did think about whether Milton would help but wanted to hear someone recommend it first. Ah & denture tabs! Good idea. What about napisan or is that too bleachy?