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The robot will have a container and a big scooper each time it scoops it will go in to the container and it will sort it so if it picks up water it will go into the water container and if it picks up any iron than it can go in to the iron container and the robot will have a magnet because a magnet will pick up any iron. If you find where the iron and water is, you could have a tube that goes from the area and bring it back to where you are. You could have a windshield wiper so each time it gets on the sensor it will clean it off. You could have six wheels, so if it gets stuck the ones that are stuck can lift up and then the ones that are not stuck can move it out.