I use a spray-bottle filled w/ distilled water to clean my bike(s), and have been pretty happy with the results. This may seem stupid, but regular water leaves spots, where you overspray, and takes more time & effort. So, when I'm cleaning the bugs off of the mirrors (front-facing) and the water gets on the tank - for example - it doesn't matter if I dry the tank off or not, when the water evaporates, you don't even see that it was ever there.

I also put the spray bottle on "stream" to shoot the required distilled water into the coolant, when it's a little low.

Obviously, it works great for your helmet visor too.