I live in MN and drive my black MX-5 year round. I wash it every two weeks, then use Pinnacle Crystal Mist afterwards and then go over that with the Meguiares Ulitmate Detailer. Am I just wasting my time. To my thinking the Crystal Mist is not going to last as long as the UD but I like the way the car shines when I am done with the CM.