Watch your vehicle next time it goes down your local car wash line.
Q: What do you see near the end of the line?
A: High Velocity Air Dryers!
Often when hand washing our vehicles I keep them wet, as mentioned, use a window squeegee on the glass, and our Electric 180mph forced air TORO blower/vac from top to bottom. That's right - A Leaf Blower!
Works like a charm and sure is cheaper than those "Portable Car Detail Blowers" sold through Cal Car Cover, et al.
Two bucket method for sure.