The best way to clean your gutters is by using a gutter scoop or a trowel. First, remove any debris that's blocking the flow of water with the scoop or trowel. Then, use a hose to spray water into the gutters and dislodge any remaining dirt or leaves. Finally, use the scoop or trowel to collect the debris and dispose of it in a trash can. If you have a lot of leaves in your gutters, it might be helpful to use a leaf blower to blow them out before cleaning them with water. Be sure to wear goggles and gloves when doing this, and take care not to blow any debris onto yourself or others.