I thought i would share this i hope it helps.

1. make sure the car is completely clean. this means clean it and dry it dont worry about water spots for now just let them dry on.

2. spray a VERY fine mist over the car and take a slightly damp cloth and rub over the area with the water spots.

3. imediately after spraying and rubbing the water spot off, take a dry towel and wipe the fine layer of water off of the area you sprayed.

Thats it. its really not that hard i usually do one area of the car at a time. If some gets on an area you have already gotten just wipe it with the dry towel before it drys to the car

Cool. I like to use some touch up detail spray once it dries. It seems to do the trick and get liittle water spots out easily...except on the hood for some reason.

You might have to rub the water spots out a little more. The warmer it is the worse it gets. I would always get water spots on my car and it would really furstrate me until i tried this.

i usually will rinse the car throughly, then use my hand as a squegee to get most of it, and use an old towel on the rest. This seems to do the trick, and we have REALLY HARD water.