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Usually the water spots are from your washing or sprinklers. Get a water softener or CRSpotless and keep it away from the sprinklers. Either that or wash in the shade, keep the car hosed down until you're done, dry quickly (windows first), and polish with something like Klasse AIO, or the DG Glass Polish (or water spot remover) to remove the ones you get.
As far as using carnauba, usually 'nuba's bead more than sealants, beading = spots, so use a sealant on the glass (something like Opti-Seal is convenient, or there is a dedicated Diamondite glass sealant).