Place the sturdy ladder on a level base. Put on heavy work gloves, non-slip shoes and safety glasses to protect you from sharp objects and falling debris.
Scoop loose leaves and debris out of the gutter system using a narrow garden trowel. Start at a drain outlet near the low end of a gutter and work away from the drain outlet. Place the leaves and debris into a plastic garbage-can liner.
Wash any further debris out of the gutter system using a water hose attached to a high-pressure nozzle. Spray the water throughout the entire gutter system, working toward the drain outlet.