Ok, so yesterday I was bored and decided to clay bar my truck. This was my first time using a clay bar and I have to say the results were impressive. After waxing the truck, I stood back admiring my handiwork and I noticed the waterspots on the glass that I never could quite get rid of. Then it hit me - why not give it a try? I took the clay bar to the glass on my truck and viola! no more water spots and the windows are now slicker than they've ever been. I finished off the job by removing the residue with Invisible Glass and hit the windshield with coat of Rain-x. Then I moved on to the chrome grille and hit it with the clay bar as well. Same result - a smooth, shiny finish. Who knew?!