How can I stop my tupperware going orange in the dishwasher?

[Jojay]

I think it's tomato sauces that does it, but everything is orange, including my twins bottles.

Is there some magic solution that I don't know about?

Stop putting anything with tomato sauce in the same load.

Rub with cooking oil re wash without any tomato.
Doesn't seem to happen often but is a pain when it does, I suspect the culprit is intense oily tomato residue like round the dish from sausage casserole. Spag Bol isn't generally a problem.

Milton gets rid of the tomato-based stains on my plastic tablecloth

Once you've got them clean wipe all orangey things out with kitchen towel before they go in the dishwasher.