Yeah, switch the headlights up, and move them manually with that knob.
Cleaning is put into up position, remove the top plate (4 screws) side bezel (4 screws), unplug headlight, unplug motor, remove entire assembly (4 bolts, some things get in the way of your wrench, you'll see), unbolt motor crank (that makes everything go up and down), unbolt motor (3 bolts?), unscrew motor plate (4 screws?), you will then see the mess. Clean it until the fingers are shiny and the round copper plate looks like copper). I shoot a little waterproof grease on the plate. Put motor back together then plug in and test the motor, if OK then put it all together (make sure the motor crank is installed in the headlight up position).
Those oil senders do go bad, heat eventually kills the internal electronics, new ones cost over a hundred, check your connector, make sure its clean and not rusted...