David Fermani
Forza Auto Salon
Heres a video to review using 3D Eraser in heavy water spot situations. As you can see, even with using a heavy cutting foam pad, the finish isnt affected other than a reduction of water spots.
https://www.youtube.com/watch?v=1psF5ne3zx4
https://www.youtube.com/watch?v=1psF5ne3zx4