Terry at JETMAC systems in ports down will sort you out a power pole etc. I always clean fascias with pressure washer and power pole. It's 4 times quicker and the results are also better. It's worth the investment as it makes life easier and more profitable!
........and you can cover the next door neighbours property in water spray and muck as well.
Whether they like it or not.
It's rare I use my pressure washer and extending lance for cleaning F/S/G's but I have done it on detached properties.
You really have to be mindful of NOT spraying the neighbouring properties, which on a windy day is not always easy.
It does a decent enough job and is easier on the arms, but on stubborn grime I find you still have to scrub a bit with the wfp brush.