PHOTOGRAPHS FROM OUR OWN WORK
What this looks like in practice.

Look beyond the leaves
Debris settles where water slows. A sagging section, incorrect fall or partially blocked outlet can make the same area troublesome after every clean. Check whether water remains after rain and explain the pattern when requesting an inspection.
Correct the cause where possible
Cleaning removes the immediate obstruction. Resetting levels, replacing brackets or correcting the outlet may be needed to stop the pattern repeating. The appropriate repair depends on the condition of the existing gutter.