though i've never done this myself, but a friend did his by mixing vinegar and water then wiped it down and wash it right after. rewax. obviously the acidity is suppose to neutralize the basic elements in the water spot.
i never tried it myself cuz claybar polish and wax worked for me, and i didn't quite like the idea of having anything w/ low ph on my car...
i never tried it myself cuz claybar polish and wax worked for me, and i didn't quite like the idea of having anything w/ low ph on my car...