ya just use a waxing pad, ya know the foam type, and rub it on and wipe it off, no need to let it dry or anything. Used regularly it will keep your hard water spots off, and reduces wear on your wiper blades. Not that you really have to use wipers, cause the water just kinda rolls off.
Mequires cleaner wax is the best stuff, I use if for everything...paint, windows, headlights, tails, non-plastic trim (like the window trims), coolant bottles, gauge plastic...pretty much anything that doesnt have a texture.