You may use Camera Wash (if equipped) to keep the image clear without getting out of your vehicle.
In an SUV or crossover, when the rear window washer is used, the camera for the Rear Camera Mirror is also washed.
In a sedan without a rear window washer, there may be a separate control for Camera Wash (if equipped). Look for it at the end of the wiper stalk, marked with both VIDEO and WASH icons. If the control is a rotating knob, turn the control away from you to wash the camera for the Rear Camera Mirror; if the control is a push-button, simply push the button at the end of the wiper stalk.