Wikipedia: Cars treated with the rustproofing displayed a sticker in the window with the name "Rusty Jones" and a picture of the cartoon character (also named Rusty Jones) from the company's TV commercials.
So there were hundreds of thousands of cars with that Rusty Jones guy on them, and they bought enough TV advertising so that decades laters people still remember the "Hello Rusty Jones, Good Bye Rusty Cars" jingle. Yet I can't find a single image of the Rusty Jones guy on the entire internet. Weird, eh? Anybody got one?
UPDATE: Reader Rick still has Rusty on his car!:
I applied a bit of Photoshoppery to old Rusty. Click on the sticker to see him in his natural habitat.