Because prior to your edit it was simply titled Mr Clean with nothing in the message.
Joke was only marginal BEFORE the explanation...so....never mind.
Ah, thanks for the explanation, I was puzzling over it. I had screwed up and hit save before I wanted to, so instead of having a dupe, I went back and checked and edited the original.
Makes sense now, though, Mr. Clean, and a blank post. Yep. ;) Only by the time I saw your reply, I had fixed it. :)
I don't read Oh Pun because I rarely get humor, so I'd rather not perplex myself.
Brenda