You know how socks wear out at the heels? Well that's where bellybutton fluff comes from, and why it is mostly blue.

Last car I had which you could crank was a 2CV, no radiator to go through (being air-cooled) but the method was otherwise the same and the handle did service also for the wheel jack. Surprisingly good in snow, also good for Rommel impersonations through the top, but not during snowstorms.