A cleaning apparatus includes a nozzle assembly and an arm supporting the nozzle assembly. In some embodiments, the arm includes a first rotatable arm member defining a first axis and a second rotatable arm member defining a second axis and connected to the first rotatable member. In certain examples, the first rotatable arm is rotatable about the first axis and the second rotatable arm is rotatable about the second axis. The cleaning apparatus also includes at least one sensor on the arm and configured to detect a position of the nozzle assembly based on rotation of the first rotatable arm or the second rotatable arm