Rodney Dangerfield once complained: I don't get any respect... last week the Jehovah's Witnesses told me that they weren't interested!

But if you need a child-safe way to "drive them off," just say through the closed door that you're dripping naked from the shower. The kids won't be "corrupted" since, presumably, even they know that people shower naked, and the grownups will head for the next address because they're either too disgusted or too turned on by the thought of you that way and want to direct their minds back to their saintly cause.