I use pencils on domestic, you can point them where ever. A fan jet is quite direct, but little bits of spray go everywhere - brickwork, vents etc. Pencils are controled. However, if you rinse ON the window, fans with good pressure (2ltr a min) create a kind of cushion hovercraft effect with the brush a makes rinsing a breeze. The bristles keep the spray in too. However, you do need to rinse ON, which needs higher pressure, which uses more water.
So pencils.