Thanks for the tip. I bought a clay bar yesterday for a 2006 Elise that I just purchased from a dealer a couple of weeks ago. I was reading the manual and Starshield information it came with last night and it said NOT to use a clay bar on the Starshield. Have you ever seen a Starshield damaged by a clay bar? What's the reasoning behind this? Is a clay bar a fairly harsh treatment? If it IS fairly harsh, how often should you use a clay bar if say you are putting a 100-200 miles or so on it each weekend?