I clean my gutters with a pool rake/vacuum pole and a shop vac blower.
It isn't elegant, but it is light and long. [more like 15', I think,
but I add 6' at the bottom, and the vac attachment adds a foot or two
to the top.]
They are about $20-30 at a pool supply.
=Check for a swimming pool telescoping extension pole. I have
a 33 ft pool and mine reaches almost the length. You can get extra
extensions and brush heads for them. Here's
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