Car robot cleaner

We have all seen those new household cleaning robots, so why dont we have one for our cars. The robot would be uploaded the interior plan of the car and be small enough to tuck under seats. It would not have wheels but rely of on several small feet to move about. It would be a multi tool robot. With suction cups on the feet so it can climb up and clean glass. A vacum, spray bottle, and a can of scented air freshener would all be built into this compact bot. It would essentially be free roaming inside the car and when it needs more power it would return to the cars cigarrette lighter for recharging. When its done it would return to its nest under the dash hidden and out of sight. It could be programmed to clean in stages lets say the drivers side 3 times a week the passenger side once a week and the whole car every other week. Oh yeah to go along with the summary, it would also have a knife or electricution device of some sort so it could defend your car.