Joe, when I had a machine like that, I turned it upside down in a big box with large pieces of styrofoam holding it in place. Then I soaked some cotton (you could use rags) in kerosene and laid them over the gunky gears. I put a lamp over it with a regular, old school lightbulb and left it on for the small amount of heat it produced. I checked on it often, and eventually the gunk loosened up.