Smurf, I'm using old wfp setup for spraying roofs, fsg. For fsg it's perfect with a fan jetted brush but for what I'm wanting it to do it's not. For rinsing I'm using the pw lance or garden tap depending on pressure.
I'm keen to have the rinsing done working at gutter level and using the wfp extended to the top and angled down to avoid water entry. I'm not so keen on using pencil jets (sniper, assassin) from the ground as you could end up with sh dripping into the attic and onto a victorian wedding dress or something.