Hi, Can someone tell me if there is a trick to using my headlight washers? I have the Bi-Xenon lights and the cut outs for the washers are there. I turn my headlights on and hold the wiper stalk towards me for at least 5-10 seconds. nothing happens except to spray my windshield with about a gallon of fluid. Is there another step like the truck has to be in drive? The owners manual is very vague... Thanks for any help...