Again (like heated seats) this is an item I've never had, and can see no use for. Please tell me otherwise if you've had experience or thoughts I've not entertained. In 30 years of driving, I've never noticed that my headlights were diminished by dirty lenses. Maybe I haven't been observant enough, but after a washing I've never observed that the lights were improved. The only application I can see would be for rally cars...slopping on real mud. Other than that, isn't this just one more gadget not needed?