Ronstar
Moderator Emeritus
Best way to remove built up debris from the gutter that I've found is to use a leaf blower. ....
+1 And start the leaf blower before you get on the roof. That way you don't have to worry about keeping your footing while yanking on the cord. Then climb the ladder, and walk around the perimeter of the roof blowing out the gutters. Takes about 5 minutes.
I do my gutters several times a year, and I'm getting shakier up there as I get older. I have an 8/12 roof pitch - I would not attempt anything steeper than that.
I'd get the 24' aluminum.