The Beatles, from A Hard Day's Night,
He's clean, very clean...
"
A little trivia... I'm a big fan of Steptoe and Son on BBC radio. This was the show that Sanford and Son was based on, so you get the idea.
Apparently, in Steptoe, Wilfred Brambell is frequently referred to as a dirty old man. Brits seeing a Hard Day's Night wherein Brambell is called 'clean' throughout the movie would have gotten the joke. When I saw the movie as a kid, I just thought they meant Brambell was physically clean. Live and learn. : )
Don't let him fool you, he's a king mixer.