To reset a robot vacuum to factory settings, you typically need to start by turning off the device and removing the battery. After a few minutes, reinsert the battery and turn the vacuum back on. Look for a reset button on the device, either on the main unit or in the app, and press it to initiate the factory reset process. Follow any on-screen instructions and wait for the device to reboot. Once the reset is complete, the robot vacuum should be restored to its original factory settings.