phyberlink

Hi, My C 280 1996 The Wiper works in all speeds, "BUT" when I turn in OFF the wiper stops at 10 o'clock meaning it does not go back all the way down to rest / stay at the down driver's side, hence it is a recipe for failing the VIRGINIA State Inspection. I did open the cover at the end of the wiper and sprayed with White Lithium Grease, but that did not help, In view that that the wiper works, then it is not the motor, so what is it? why the wiper does not go all the way down to the resting place ?
Thanks in advance for any help