New answers tagged washing
This occurs pretty often with leeks as well. The procedure there is to cut open the stalks lengthwise - i.e. one cut from top to bottom along the long axis. This allows you to fan apart the layers to ease out any trapped dirt. You could do the same thing with your green onions, assuming you don't mind cutting them lengthwise. If you don't want to cut, ...
Generally, yes, to wash off any chemicals that might have been used to finish the plastics or rinse any sprue away. If you're going to be putting the dishwasher on anyway, you might as well throw them in.
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