I did a 2007 Mercedes s550 today that sits at the shore all summer in the hot sun and gets hit by sprinklers everyday. Long story short there were water spots everywhere. I gave the car about 5 acid washes, clayed out the butt, compounded, polished, waxed... The windows still have faint water spots on them! I have dp glass polish, but does anyone have any ideas? I didnt have the ability to get a shot of this, but I will next time I clean it. :sadpace: