Clean garbage

So mom comes home from the center and Julia is cutting up a pork loin into cubes. In the sink sits the plastic wrap that the pork came in. What does a good housekeeper do before throwing away the plastic wrap? One washes it of course! I ask why and the response is: because it is durty. I point out that it is garbage and we don't care that the garbage is durty, she says I should just thank her instead of complaining about all the hard work she does.