"Behold, all things are clean for you"

Jesus' teaching in Luke 11.41 always sounds so refreshing to me: "Give that which is within as charity and, behold, all things are clean for you."

I wonder if there is an irony in the passage. Jesus is teaching against thinking that food made the Jews unclean on the inside. (Not to minimize things, Jesus' upshot is that humans do not need food to make us unclean -- our hearts are sufficient for that.) So I wonder if the thrust isn't something like this -- it's not the food that fills us on the inside that makes us clean, but rather it's unfilling ourselves that makes us clean, i.e., giving away that which is inside.