Not sure if Charley Jordan's song "Keep It Clean" is actually dirty, but Charley tells us how to keep it clean. An easy-going blues with a sweet touch, this song exemplifies the good times of 1920s blues music.

"Ride him over;
Give him Coca-Cola,
Lemon soda,
Sauce of ice cream.
It takes soap n' water,
For to keep it clean."

Here's a link to a free (and legal) download of "Keep It Clean" from the Internet Archive:

http://www.archive.org/details/KeepItClean