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Soooo I've tried a couple of methods to see which cleans up best.
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You can use the liquid bleach, or a bleach powder and turn it into a paste.
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Remember - when you are first rinsing your Tupperware/plastic things/Ziploc don't rinse with hot water , rinse with cold water.
In my opinion the issue with tomato based pasta sauces is that the additional colouring to make them red means that the stain will be there.
I find when I make my own tomato pasta sauce this doesn't happen as much. Also a bonus to making your own pasta sauce is that it takes no time at all and you get to see exactly what you are putting into your sauce.
However, they do say that prevention is better than a cure soooo I've recently learnt that if you spray the inside of your plastic container with a little bit of oil - this works super well I don't know why but it means the sauce doesn't seem to stain the same way. I've done this numerous times now and it works a charm.
Alternatively put some plastic wrap on the inside, pour the spaghetti and sauce in , close the plastic wrap over the top and then pop the lid on - or use a black base plastic or something that is not clear. That way you won't get annoyed when it stains because you won't see it.
If it smells like sauce after you've washed them, place a cut up lemon inside and zap it in the microwave for a minute.
Hope this helps ;-) I'm working on things to do with vinegar now. Let the experimenting and researching continue!