Most "experts" don't recommend them as they make the brakes run hotter and potentially warp the rotors. Does your car have the lower dust pads? I would have thought that it would have come with them. Complain to Lexus about the dust and see what they will do. My wife's 2007 IS had the regular pads and Lexus changed them to the lower dust at about 500 miles. I don't have any accumulation of dust, regardless of time in between washings.