When the “pros” did my new gutters,they installed downspouts with the screws so they grab everything that floats by. I finally went and flipped them around. But today i need to get up there and blow the oak leaves out. And off the roof.
I don't envy you there. I had done that 2 weeks ago but pine needles and "mini pine cones" I call them are probably packed into the down spouts like cord wood.