I’m probably debasing myself by even commenting on this semi-ridiculous scenario, but . . .
Find a piece of chometz on pesach: Cover with a napkin, pick it up, flush it down the toilet, clean more carefully next year.
I’m not sure what running out of your house would accomplish; you would still have chometz in your reshus (though not yours, obviously, since you hopefully were mevatel it prior to yom tov).
Now radiation, I don’t think flushing it is the best option. Considering HOW it is damaging, a safe distance is probably your best bet.
C’mon people, making yourselves crazy about errors in cleaning judgement that you cannot correct until next year is not what simchas yom tov is all about. If anything, the best tribute to your commitment to Torah would be to deal with the unwanted stray noodle the way the halacha instruct you to, and not go crazy because in your own mind you have just committed every yeharog v’al vaavor in the book and then some. Allowing your personal feelings about the terribleness of the chometz to override the Torah’s instruction about how to deal with it is not much better than chomping down on a bagel because you REALLY wanted it.