Fast Freddy Kaye

I just purchased a new 06 GTO, Love it, but I think they left it in the sprinklers. I cannot get the calcium spots out of the paint or completely off the windows. I've tried most of the common methods, Is there a product out there I could use? I've been told to try 0000 steel wool on the windows, but I'm afraid of swirl marks. And short of cutting and polishing the paint, I've tried 3 or 4 different waxes, polishes , Any suggestions? A friend said use fast orange on the windows, but I think pumice is a rock isnt it? Thanks...