Walking out of the house and leaving a robot to handle the vacuuming or mopping truly feels like we’re living in the future. Whether you’re looking for extra help when you’re not around, or simply want to recline on the sofa with your feet-up and let a robot handle the cleaning — these clever self-steering ‘bots are more affordable than ever. iRobot, the Massachusetts-based brand behind the best-selling Roomba robotic vacuum cleaners, has kickstarted its final sale of the summer. It has discounted up to £500 off its best-known Roomba range. The Roomba sale is scheduled to end at 11am on Septem…