Good job on using the search feature. The more you can get out the better. The only way to clean it all out is take the box apart. I'd get a suction gun or turkey baster a suck out as much as possible. It take some time to fill it with the corn head grease. Take your time and work it in. I fill mine to the bottom of the plug. I also jack the front wheels up and turn the wheel slowly lock to lock a few times, this helps work the grease through the moving parts.
