I personally only do windows, but to do a job like that, do you simply just change the angle of the brush so it's pointing straight up (for gutters) and just scrub scrub scrub???
MattCleared by hand and it was a sod. Could only just get my hand between the tiles and gutter, full of nice thick sticky sludge. No chemicals, just pure. It's amazing how much grime can be removed by just brushing with pure or tap water.I sometimes dip the brush in neat unger fluid to speed things up but this one was quite easy to clean.