1) Scoop out loose debris.
Starting at a drain outlet at the low end of a gutter, use a narrow garden trowel to scoop out loose debris, working away from the drain outlet. Itís usually easiest to do this when the debris is slightly damp and pliable, not soggy or dried and encrusted. To minimize cleanup later, you can scoop the debris into a plastic garbage-can liner.
2) Blast out the gutters with a hose.
Using an on-off high-pressure nozzle mounted at the end of a water hose, wash out each length of gutter, working toward the drain outlet. This can be a messy job; try to avoid splattering mud all over your house. If necessary, use a stiff scrub brush to remove encrusted dirt.
3) Clear obstructions in drainpipes.
If water doesnít drain freely through the drainpipes, try flushing the debris down them with a hose. If that doesnít work, use a plumberís auger (snake) to free and pull out the debris from the bottom.