A gutter cleaning robot can traverse rain gutters to agitate and remove debris. The gutter cleaning robot is equipped with a debris auger at a front end that contacts and ejects the debris, and has a drive system for propelling the gutter cleaning robot along the rain gutter. The debris auger can include a spiral screw or various other forms of auger, and may be interchangeable by the user so as to enhance the effectiveness of the gutter cleaning robot in various environments or modes of operation.