I converted a fish landing net handle that I bought in Aldi's. It is 3 section telescopic and about 2.5 ft closed, so easily used with one hand. The aluminium sections are grooved, so the sections can't spin.
I wish they made these poles 18ft long, they would be perfect to use clampless.
I have several town houses on a marina, many of these have small balconies and I was having the same problems as you.
Those chairs are handy to step onto when getting off the ladder, but do get in the way when cleaning.