This disclosure is directed to a system designed for automatic de-clogging a rain gutter and a downspout. The system (also referred to as a gutter dredger) comprises a motion device (motor) and a cleaning device. When it is raining, rain water can power the system to cause reciprocating motions of the cleaning device that can result in de-clogging of a gutter and a downspout that have the system installed. A debris removal device may be positioned in the downspout to remove big debris before it moves into the motor. The gutter dredger can be used for automatically de-clogging a gutter and downspout whenever it is raining.